Correct CGI UID/GID information in cgi.md

The Fcgiwrap's change to a new UID/GID has already been in effect
at least since 25 January 2026 20:32:26 GMT. This patch updates
the corresponding Tilde.club Wiki page to reflect this change.

This patch is provided to Tilde.club under the terms of
GNU General Public License, any version
published by the Free Software Foundation.

wiki/source/cgi.md

@@ -424,13 +424,17 @@ And some caveats:
   If you would like to distribute these verbatim as source files,
   you might want to workaround by renaming such files
   to add <q><samp>.txt</samp></q> at the end.
-- CGI programs here run under web server's credentials:
-  user <q><samp>nginx</samp></q>
-  and group <q><samp>nginx</samp></q>
-  (user ID <samp>994</samp>,
-  group ID <samp>990</samp>);
+- CGI programs here run under a dedicated user <q><samp>cgiwrap</samp></q>
+  and group <q><samp>cgiwrap</samp></q>
+  (user ID <samp>480</samp>,
+  group ID <samp>463</samp>);
   tread carefully if you need to make your program read/write
   private files.
+  Note that this is also different
+  from the credentials that the web server itself uses
+  when serving static files
+  (user <q><samp>nginx</samp></q> ID <samp>994</samp>,
+  group <q><samp>nginx</samp></q> ID <samp>990</samp>).
 
 Further Reading
 ---------------