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>

module/statprof.scm

@@ -319,7 +319,7 @@ than @code{statprof-stop}, @code{#f} otherwise."
   
 ;; Do not call this from statprof internal functions -- user only.
 (define* (statprof-stop #:optional (state (ensure-profiler-state)))
-  "Stop the profiler.@code{}"
+  "Stop the profiler."
   ;; After some head-scratching, I don't *think* I need to mask/unmask
   ;; signals here, but if I'm wrong, please let me know.
   (set-profile-level! state (- (profile-level state) 1))