pselect: Document this module

[Bruno Haible via Gnulib discussion list]

The module 'pselect' was added in 2011, but never documented.


2025-01-08  Bruno Haible  <br...@clisp.org>

        pselect: Document this module.
        * doc/posix-functions/pselect.texi: Document module 'pselect'.

diff --git a/doc/posix-functions/pselect.texi b/doc/posix-functions/pselect.texi
index c0a48af07e..4d85dd1eea 100644
--- a/doc/posix-functions/pselect.texi
+++ b/doc/posix-functions/pselect.texi
@@ -4,7 +4,8 @@
 
 POSIX specification:@* 
@url{https://pubs.opengroup.org/onlinepubs/9799919799/functions/pselect.html}
 
-Gnulib module: ---
+Gnulib module: pselect
+@mindex pselect
 
 Portability problems fixed by Gnulib:
 @itemize