tidy-up: miscellaneous

- schannel: delete superfluous parenthesis.
- tftp: delete stray space from log output.
- ws: update guard comment.
- docs/examples: constify variables.
- runtests/servers: enclose unknown parameter between quotes.
- scripts/perlcheck.sh: drop redundant grep `-E` option.
- THANKS: move names from comments to THANKS.
- sync `--depth` option style across scripts.
- sync git repo URL ending between some scripts.
- BINDINGS.md: drop protocol from archive.org URL path.
- whitespace, indent, unfold lines.

Closes #19565

docs/examples/multi-debugcallback.c

@@ -34,7 +34,7 @@
 
 #define TRUE 1
 
-static void dump(const char *text, FILE *stream, unsigned char *ptr,
+static void dump(const char *text, FILE *stream, const unsigned char *ptr,
                  size_t size, char nohex)
 {
   size_t i;