Fix typos throughout codebase.

* NEWS:
* doc/ref/api-control.texi:
* doc/ref/api-data.texi:
* doc/ref/api-debug.texi:
* doc/ref/api-deprecated.texi:
* doc/ref/api-evaluation.texi:
* doc/ref/api-foreign.texi:
* doc/ref/api-i18n.texi:
* doc/ref/api-io.texi:
* doc/ref/api-languages.texi:
* doc/ref/api-macros.texi:
* doc/ref/api-memory.texi:
* doc/ref/api-modules.texi:
* doc/ref/api-options.texi:
* doc/ref/api-peg.texi:
* doc/ref/api-procedures.texi:
* doc/ref/api-scheduling.texi:
* doc/ref/api-undocumented.texi:
* doc/ref/api-utility.texi:
* doc/ref/expect.texi:
* doc/ref/goops.texi:
* doc/ref/misc-modules.texi:
* doc/ref/posix.texi:
* doc/ref/repl-modules.texi:
* doc/ref/scheme-ideas.texi:
* doc/ref/scheme-scripts.texi:
* doc/ref/srfi-modules.texi:
* gc-benchmarks/larceny/dynamic.sch:
* gc-benchmarks/larceny/twobit-input-long.sch:
* gc-benchmarks/larceny/twobit.sch:
* libguile/gc.h:
* libguile/ioext.c:
* libguile/list.c:
* libguile/options.c:
* libguile/posix.c:
* libguile/threads.c:
* module/ice-9/boot-9.scm:
* module/ice-9/optargs.scm:
* module/ice-9/ports.scm:
* module/ice-9/pretty-print.scm:
* module/ice-9/psyntax.scm:
* module/language/elisp/parser.scm:
* module/language/tree-il/compile-bytecode.scm:
* module/srfi/srfi-37.scm:
* module/srfi/srfi-43.scm:
* module/statprof.scm:
* module/texinfo/reflection.scm:
* test-suite/tests/eval.test:
* test-suite/tests/fluids.test:
Fix typos.

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

libguile/threads.c

@@ -902,7 +902,7 @@ enum scm_mutex_kind {
   /* An unowned mutex is like a standard mutex, except that it can be
      unlocked by any thread.  A corrolary of this behavior is that a
      thread's attempt to lock a mutex that it already owns will block
-     instead of signalling an error, as it could be that some other
+     instead of signaling an error, as it could be that some other
      thread unlocks the mutex, allowing the owner thread to proceed.
      This kind of mutex is a bit strange and is here for use by
      SRFI-18.  */