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/headerapi.c

@@ -33,7 +33,7 @@ static size_t write_cb(char *data, size_t n, size_t l, void *userp)
   /* take care of the data here, ignored in this example */
   (void)data;
   (void)userp;
-  return n*l;
+  return n * l;
 }
 
 int main(void)