[PATCH 2/2] docs: convert concept manpages to git-*

The manpages for commands have always been spelled git-cmd. But concept manpages, like gitrevisions were spelled without the dash. This is complex, and does not actually buy anything. You might think it creates a separate namespace for concepts and commands, but git help foo will prefer the

Re: [PATCH 2/2] docs: convert concept manpages to git-*

Jeff King wrote: Let's just call everything git-*, which is simpler. This patch renames the documentation files, updates the Makefile to find them, and updates internal linkgit references to the pages. It updates builtin/help.c so that users of git help foo will not even notice the