doc: Improve documentation of previous POSIX functions.

[Collin Funk]

Hi Paul,

I noticed that when updating the docs for POSIX 2024 you improved the
documentation for removals from POSIX [1]. Like this:

diff --git a/doc/pastposix-functions/bcmp.texi 
b/doc/pastposix-functions/bcmp.texi
index 13906aabd2..00ef702a7a 100644
--- a/doc/pastposix-functions/bcmp.texi
+++ b/doc/pastposix-functions/bcmp.texi
@@ -2,7 +2,8 @@
 @section @code{bcmp}
 @findex bcmp
 
-POSIX specification: 
@url{https://pubs.opengroup.org/onlinepubs/009695399/functions/bcmp.html}
+Removed in POSIX.1-2008.
+POSIX.1-2004 specification: 
@url{https://pubs.opengroup.org/onlinepubs/009695399/functions/bcmp.html}

I've committed this patch doing the same for the rest of the files in
doc/pastposix-functions/*.texi since I think it is helpful.

Are POSIX functions always removed the following release that they are
marked obsolete? Or can obsolete functions be kept for multiple
versions?

Collin

[1] https://lists.gnu.org/archive/html/bug-gnulib/2024-05/msg00389.html

0001-doc-Improve-documentation-of-previous-POSIX-function.patch
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