doc: asciidoc: remove custom header macro

In 2007 we added a custom header macro to provide version information
7ef195b (Documentation: Add version information to man pages,
2007-03-25),

However, in 2008 asciidoc added the attributes to do this properly [1].

This was not implemented in Git until 2019: 226daba (Doc/Makefile:
give mansource/-version/-manual attributes, 2019-09-16).

But in 2023 we are doing it properly, so there's no need for the custom
macro.

[1] asciidoc-py/asciidoc-py@ad78a3c

Cc: Martin Ågren <[email protected]>
Signed-off-by: Felipe Contreras <[email protected]>
Reviewed-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: felipec

Documentation/asciidoc.conf

@@ -51,25 +51,6 @@ ifdef::doctype-manpage[]
 endif::doctype-manpage[]
 endif::backend-docbook[]
 
-ifdef::doctype-manpage[]
-ifdef::backend-docbook[]
-[header]
-template::[header-declarations]
-<refentry>
-<refmeta>
-<refentrytitle>{mantitle}</refentrytitle>
-<manvolnum>{manvolnum}</manvolnum>
-<refmiscinfo class="source">{mansource}</refmiscinfo>
-<refmiscinfo class="version">{manversion}</refmiscinfo>
-<refmiscinfo class="manual">{manmanual}</refmiscinfo>
-</refmeta>
-<refnamediv>
-  <refname>{manname}</refname>
-  <refpurpose>{manpurpose}</refpurpose>
-</refnamediv>
-endif::backend-docbook[]
-endif::doctype-manpage[]
-
 ifdef::backend-xhtml11[]
 [attributes]
 git-relative-html-prefix=