branch: clarify <oldbranch> term

Since 52d59cc645 (branch: add a --copy (-c) option to go with --move
(-m), 2017-06-18) <oldbranch> is used in more operations than just -m.

Let's also clarify what we do if <oldbranch> is omitted.

Signed-off-by: Rubén Justo <rjusto@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-branch.txt b/Documentation/git-branch.txt
index 4395aa935438aaac47cfe41f5db7a1eadafe8a25..0b08442932354fcdcbb321f0c45b80a3a5bc4fdf 100644 (file)
--- a/Documentation/git-branch.txt
+++ b/Documentation/git-branch.txt
@@ -312,7 +312,8 @@ superproject's "origin/main", but tracks the submodule's "origin/main".
        option is omitted, the current HEAD will be used instead.
 
 <oldbranch>::
-       The name of an existing branch to rename.
+       The name of an existing branch.  If this option is omitted,
+       the name of the current branch will be used instead.
 
 <newbranch>::
        The new name for an existing branch. The same restrictions as for