git: include the manual page for Git Bash again

This is yet another victim of that clumsily-executed and under-prepared
`.txt` -> `.adoc` change in upstream Git.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

mingw-w64-git/PKGBUILD

@@ -48,7 +48,7 @@ source=("${_realname}"::"git+https://github.com/git-for-windows/git.git#tag=v$ta
 	'start-ssh-pageant.cmd'
 	'git-wrapper.c'
 	'git-bash.rc'
-	'git-bash.txt'
+	'git-bash.adoc'
 	'git-cmd.rc'
 	'git-wrapper.rc'
 	'gitk.rc'