superproject: change the warning message to say it is beta.

$ repo_dev init --use-superproject -u https://android.googlesource.com/platform/manifest
remote: Total 3 (delta 0), reused 3 (delta 0)
NOTICE: --use-superproject is in beta; report any issues to the address described in `repo version`
...

$ ./run_tests -v

Bug: [google internal] b/189946009
Change-Id: Ifb3ef266a72b67f3c4a2a3ac2033b10e03b789d4
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/308522
Reviewed-by: Jonathan Nieder <jrn@google.com>
Tested-by: Raman Tenneti <rtenneti@google.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/git_superproject.py b/git_superproject.py
index 62f2d52f..f7ccd574 100644
--- a/git_superproject.py
+++ b/git_superproject.py
@@ -173,8 +173,8 @@ class Superproject(object):
     Returns:
       True if sync of superproject is successful, or False.
     """
-    print('WARNING: --use-superproject is experimental and not '
-          'for general use', file=sys.stderr)
+    print('NOTICE: --use-superproject is in beta; report any issues to the '
+          'address described in `repo version`', file=sys.stderr)
 
     if not self._manifest.superproject:
       print('error: superproject tag is not defined in manifest',