completion: Get rid of tabbed indentation in comments. Replace with spaces.

Signed-off-by: Ted Pavlic <ted@tedpavlic.com>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -34,11 +34,11 @@
 #       are currently in a git repository.  The %s token will be
 #       the name of the current branch.
 #
-#	In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty
-#	value, unstaged (*) and staged (+) changes will be shown next
-#	to the branch name.  You can configure this per-repository
-#	with the bash.showDirtyState variable, which defaults to true
-#	once GIT_PS1_SHOWDIRTYSTATE is enabled.
+#       In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty
+#       value, unstaged (*) and staged (+) changes will be shown next
+#       to the branch name.  You can configure this per-repository
+#       with the bash.showDirtyState variable, which defaults to true
+#       once GIT_PS1_SHOWDIRTYSTATE is enabled.
 #
 # To submit patches:
 #