[PATCH] Fix section about backdating tags in the git-tag docs

["Björn Steinbrink" <B.Steinbrink@gmx.de>]

The tagger is equal to the committer, not the author, so
GIT_COMMITTER_DATE is the right environment variable to use, not
GIT_AUTHOR_DATE.

Signed-off-by: Björn Steinbrink <B.Steinbrink@gmx.de>
---
 Documentation/git-tag.txt |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index 4b6fd90..9712392 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -233,14 +233,14 @@ the tag object affects, for example, the ordering of tags in the
 gitweb interface.
 
 To set the date used in future tag objects, set the environment
-variable GIT_AUTHOR_DATE to one or more of the date and time.  The
+variable GIT_COMMITTER_DATE to one or more of the date and time.  The
 date and time can be specified in a number of ways; the most common
 is "YYYY-MM-DD HH:MM".
 
 An example follows.
 
 ------------
-$ GIT_AUTHOR_DATE="2006-10-02 10:31" git tag -s v1.0.1
+$ GIT_COMMITTER_DATE="2006-10-02 10:31" git tag -s v1.0.1
 ------------
 
 
-- 
1.5.5.rc3.7.gba133