doc: rename .pod.in files that don't use templating to .pod

doc: rename .pod.in files that don't use templating to .pod

These man page source files only used the output_do_not_edit_headers()
template function, which just generates a comment. Since they don't
use any meaningful templating, rename them from .pod.in to .pod and
remove the template line and build.info generation rules.

Files renamed:
- openssl-asn1parse.pod.in -> openssl-asn1parse.pod
- openssl-cmds.pod.in -> openssl-cmds.pod
- openssl-fipsinstall.pod.in -> openssl-fipsinstall.pod
- openssl-info.pod.in -> openssl-info.pod
- openssl-sess_id.pod.in -> openssl-sess_id.pod
- openssl-version.pod.in -> openssl-version.pod
- openssl-configutl and openssl-errstr .pod.in

Fixes #27760

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Reviewed-by: Frederik Wedel-Heinen <fwh.openssl@gmail.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
MergeDate: Fri Feb 13 14:50:16 2026
(Merged from https://github.com/openssl/openssl/pull/29838)