Fix a typo in _git.

["Mikael Magnusson" <mikachu@xxxxxxxxx>]

I have some other _git patches too, but they're sort of jumbled up and have
some XXXes, but if anyone is curious they can look here:
http://git.mika.l3ib.org/?p=zsh-cvs.git;a=history;f=Completion/Unix/Command/_git;h=mika

--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -2271,7 +2271,7 @@ _git-rev-parse () {
     '--git-dir[show "$GIT_DIR" if defined else show path to ".git"
directory]' \
     '--short=-[show only handful hexdigits prefix]:: :_guard
"[[\:digit\:]]#" number' \
     {--after=-,--since=-}'[show "--max-age=" parameter corresponding
given date string]:datestring' \
-    {--berore=-,--until=-}'[show "--min-age=" parameter corresponding
given date string]:datestring' \
+    {--before=-,--until=-}'[show "--min-age=" parameter corresponding
given date string]:datestring' \
     '*:objects:__git_objects' && ret=0
 }


-- 
Mikael Magnusson