gits: tweak "Rebasing" output

Change-Id: I81d57481650c6f94a3816f04d7b93e28bbc7f9c3
diff --git a/src/gits b/src/gits
index 7e5493e..99c899a 100755
--- a/src/gits
+++ b/src/gits
@@ -261,7 +261,7 @@
 
     upstream_branch = git_branch_upstream(git_dir, orig_branch)
 
-    print('Rebasing %r onto %r' % (orig_branch, upstream_branch))
+    print('Checking for rebase of %r onto %r' % (orig_branch, upstream_branch))
     ahead, behind = git_ahead_behind(git_dir, orig_branch, upstream_branch)
 
     if git_has_modifications(git_dir):