Re: [PATCH] git-tag.txt: <commit> for --contains is optional

This goes far back to e84fb2f (branch --contains: default to HEAD -
2008-07-08) where the same parsing code is shared with
builtin/tag.c. git-branch.txt correctly states that <commit> for
--contains is optional while git-tag.txt does not. Correct it.

Signed-off-by: Nguyễn Thái Ngọc Duy <redacted>
---
 Documentation/git-tag.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index c418c44..404257d 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt

@@ -103,8 +103,9 @@ OPTIONS
 +
 This option is only applicable when listing tags without annotation lines.
 
---contains <commit>::
-	Only list tags which contain the specified commit.
+--contains [<commit>]::
+	Only list tags which contain the specified commit (HEAD if not
+	specified).