Documentation/Makefile: Some `git-*.txt' files aren't manpages.
Documentation/Makefile: Some `git-*.txt' files aren't manpages.

In particular, git-tools.txt isn't a manpage, and my Asciidoc gets upset
by it.  The simplest fix is to Remove articles from the list of manpages
the Makefile.

Signed-off-by: Mark Wooding <b35459fcbfd785b102e4d0328c70c35968267348@distorted.org.uk>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git