[PATCH] Document the simple way of using of git-cat-file

[Robin Rosenberg <robin.rosenberg@dewire.com>]

From: Robin Rosenberg <robin.rosenberg@dewire.com>

Since you can give a version and a path name to git-cat-file,
mention it in the man page.

Signed-off-by: Robin Rosenberg <robin.rosenberg@dewire.com>
---

 Documentation/git-cat-file.txt |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
index 5e9cbf8..7abbf27 100644
--- a/Documentation/git-cat-file.txt
+++ b/Documentation/git-cat-file.txt
@@ -8,13 +8,14 @@ git-cat-file - Provide content or type i
 
 SYNOPSIS
 --------
-'git-cat-file' [-t | -s | -e | -p | <type>] <object>
+'git-cat-file' [-t | -s | -e | -p | <type>] [<object> | <commit-ish>:<path> ]
 
 DESCRIPTION
 -----------
 Provides content or type of objects in the repository. The type
 is required unless '-t' or '-p' is used to find the object type,
-or '-s' is used to find the object size.
+or '-s' is used to find the object size. The more user friendly variant
+takes a revision and a path name corresponding to the blob you want to see.
 
 OPTIONS
 -------
@@ -57,6 +58,9 @@ If '-p' is specified, the contents of <o
 Otherwise the raw (though uncompressed) contents of the <object> will
 be returned.
 
+If you don't know the object id, you can supply a version identifies,
+such as a branch name, a commit id or tag followed by a colon and a
+path name.
 
 Author