Documentation: gitrevisions

Create a new man page gitrevisions(7) which contains the revsions and
ranges documentation but not more. This uses (per include) the same bits
as the pertaining section of git-rev-parse(1).
Signed-off-by: NMichael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/Makefile

@@ -6,7 +6,7 @@ MAN5_TXT=gitattributes.txt gitignore.txt gitmodules.txt githooks.txt \
 	gitrepository-layout.txt
 MAN7_TXT=gitcli.txt gittutorial.txt gittutorial-2.txt \
 	gitcvs-migration.txt gitcore-tutorial.txt gitglossary.txt \
-	gitdiffcore.txt gitworkflows.txt
+	gitdiffcore.txt gitrevisions.txt gitworkflows.txt
 
 MAN_TXT = $(MAN1_TXT) $(MAN5_TXT) $(MAN7_TXT)
 MAN_XML=$(patsubst %.txt,%.xml,$(MAN_TXT))

Documentation/gitrevisions.txt

+gitrevisions(7)
+================
+
+NAME
+----
+gitrevisions - specifying revisions and ranges for git
+
+SYNOPSIS
+--------
+gitrevisions
+
+
+DESCRIPTION
+-----------
+
+Many Git commands take revision parameters as arguments. Depending on
+the command, they denote a specific commit or, for commands which
+walk the revision graph (such as linkgit:git-log[1]), all commits which can
+be reached from that commit. In the latter case one can also specify a
+range of revisions explicitly.
+
+In addition, some Git commands (such as linkgit:git-show[1]) also take
+revision parameters which denote other objects than commits, e.g. blobs
+("files") or trees ("directories of files").
+
+include::revisions.txt[]
+
+
+SEE ALSO
+--------
+linkgit:git-rev-parse[1]
+
+GIT
+---
+Part of the linkgit:git[1] suite