Fix typos throughout codebase.

* NEWS:
* README:
* doc/r5rs/r5rs.texi:
* doc/ref/api-data.texi:
* doc/ref/api-debug.texi:
* doc/ref/api-evaluation.texi:
* doc/ref/api-io.texi:
* doc/ref/api-macros.texi:
* doc/ref/api-procedures.texi:
* doc/ref/api-scheduling.texi:
* doc/ref/api-undocumented.texi:
* doc/ref/libguile-concepts.texi:
* doc/ref/posix.texi:
* doc/ref/srfi-modules.texi:
* doc/ref/vm.texi:
* doc/ref/web.texi:
* examples/box-dynamic-module/box.c:
* examples/box-dynamic/box.c:
* examples/box-module/box.c:
* examples/box/box.c:
* examples/safe/safe:
* examples/scripts/README:
* examples/scripts/hello:
* gc-benchmarks/larceny/twobit-input-long.sch:
* gc-benchmarks/larceny/twobit-smaller.sch:
* gc-benchmarks/larceny/twobit.sch:
* libguile/expand.c:
* libguile/load.c:
* libguile/net_db.c:
* libguile/scmsigs.c:
* libguile/srfi-14.c:
* libguile/threads.c:
* meta/guile.m4:
* module/ice-9/match.upstream.scm:
* module/ice-9/ports.scm:
* module/language/cps/graphs.scm:
* module/scripts/doc-snarf.scm:
* module/srfi/srfi-19.scm:
* module/system/repl/command.scm:
* test-suite/tests/srfi-18.test:
Fix typos.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

module/ice-9/match.upstream.scm

@@ -28,7 +28,7 @@
 
 ;;> @example{(let ((ls (list 1 2 3))) (match ls ((1 2 3) #t)))}
 
-;;> If no patterns match an error is signalled.
+;;> If no patterns match an error is signaled.
 
 ;;> Identifiers will match anything, and make the corresponding
 ;;> binding available in the body.
@@ -261,7 +261,7 @@
 ;;> of the entire @scheme{match}.  If a @var{failure} is provided,
 ;;> then it is bound to a procedure of no arguments which continues,
 ;;> processing at the next @var{pattern}.  If no @var{pattern} matches,
-;;> an error is signalled.
+;;> an error is signaled.
 
 ;; The basic interface.  MATCH just performs some basic syntax
 ;; validation, binds the match expression to a temporary variable `v',

module/ice-9/ports.scm

@@ -409,7 +409,7 @@ interpret its input and output."
           file #:key (binary #f) (encoding #f) (guess-encoding #f))
   "Takes a string naming an existing file and returns an input port
 capable of delivering characters from the file.  If the file
-cannot be opened, an error is signalled."
+cannot be opened, an error is signaled."
   (open-file file (if binary "rb" "r")
              #:encoding encoding
              #:guess-encoding guess-encoding))
@@ -417,7 +417,7 @@ cannot be opened, an error is signalled."
 (define* (open-output-file file #:key (binary #f) (encoding #f))
   "Takes a string naming an output file to be created and returns an
 output port capable of writing characters to a new file by that
-name.  If the file cannot be opened, an error is signalled.  If a
+name.  If the file cannot be opened, an error is signaled.  If a
 file with the given name already exists, the effect is unspecified."
   (open-file file (if binary "wb" "w")
              #:encoding encoding))
@@ -442,7 +442,7 @@ string naming a file.  The file must
 already exist. These procedures call PROC
 with one argument: the port obtained by opening the named file for
 input or output.  If the file cannot be opened, an error is
-signalled.  If the procedure returns, then the port is closed
+signaled.  If the procedure returns, then the port is closed
 automatically and the values yielded by the procedure are returned.
 If the procedure does not return, then the port will not be closed
 automatically unless it is possible to prove that the port will
@@ -459,7 +459,7 @@ string naming a file.  The behaviour is unspecified if the file
 already exists. These procedures call PROC
 with one argument: the port obtained by opening the named file for
 input or output.  If the file cannot be opened, an error is
-signalled.  If the procedure returns, then the port is closed
+signaled.  If the procedure returns, then the port is closed
 automatically and the values yielded by the procedure are returned.
 If the procedure does not return, then the port will not be closed
 automatically unless it is possible to prove that the port will

module/language/cps/graphs.scm

@@ -86,14 +86,14 @@ member, or @code{#f} otherwise."
 (define (invert-bijection map)
   "Assuming the values of @var{map} are integers and are unique, compute
 a map in which each value maps to its key.  If the values are not
-unique, an error will be signalled."
+unique, an error will be signaled."
   (persistent-intmap
    (intmap-fold (lambda (k v out) (intmap-add! out v k)) map empty-intmap)))
 
 (define (invert-partition map)
   "Assuming the values of @var{map} are disjoint intsets, compute a map
 in which each member of each set maps to its key.  If the values are not
-disjoint, an error will be signalled."
+disjoint, an error will be signaled."
   (intmap-fold (lambda (k v* out)
                  (intset-fold (lambda (v out) (intmap-add out v k)) v* out))
                map empty-intmap))

module/scripts/doc-snarf.scm

@@ -24,8 +24,8 @@
 ;; Usage: doc-snarf FILE
 ;;
 ;; This program reads in a Scheme source file and extracts docstrings
-;; in the format specified below.  Additionally, a procedure protoype
-;; is infered from the procedure definition line starting with
+;; in the format specified below.  Additionally, a procedure prototype
+;; is inferred from the procedure definition line starting with
 ;; (define... ).
 ;;
 ;; Currently, two output modi are implemented: texinfo and plaintext.
@@ -33,9 +33,9 @@
 ;; `--texinfo, -t' command line option.
 ;;
 ;; Format: A docstring can span multiple lines and a docstring line
-;; begins with `;; ' (two semicoli and a space). A docstring is ended
+;; begins with `;; ' (two semicolons and a space). A docstring is ended
 ;; by either a line beginning with (define ...) or one or more lines
-;; beginning with `;;-' (two semicoli and a dash). These lines are
+;; beginning with `;;-' (two semicolons and a dash). These lines are
 ;; called `options' and begin with a keyword, followed by a colon and
 ;; a string.
 ;;
@@ -219,7 +219,7 @@ return the standard internal docstring if found.  Return #f if not."
 ;; to be written in language @var{lang}.
 ;;-Author: Martin Grabmueller <mgrabmue@cs.tu-berlin.de>
 ;;-Created: 2001-02-17
-;;-ttn-mod: regluarize lang parm lookup, add "std int doc" snarfing (2 places)
+;;-ttn-mod: regularize lang parm lookup, add "std int doc" snarfing (2 places)
 (define (snarf input-file lang)
   (let* ((i-p (open-input-file input-file))
          (parm-regexp (lambda (parm) (make-regexp (lang-parm lang parm))))

module/srfi/srfi-19.scm

@@ -320,7 +320,7 @@
 ;;       (* (remainder current-ms 1000) 10000))))
 
 ;; -- we define it to be the same as TAI.
-;;    A different implemention of current-time-monotonic
+;;    A different implementation of current-time-monotonic
 ;;    will require rewriting all of the time-monotonic converters,
 ;;    of course.
 

module/system/repl/command.scm

@@ -166,7 +166,7 @@
 (define (meta-command repl)
   (let ((command (read-command repl)))
     (cond
-     ((eq? command *unspecified*)) ; read error, already signalled; pass.
+     ((eq? command *unspecified*)) ; read error, already signaled; pass.
      ((not (symbol? command))
       (format #t "Meta-command not a symbol: ~s~%" command))
      ((lookup-command command)