remotenames: mark the extension as EXPERIMENTAL

I still don't feel confident about locking the behavior of all the things in
the remotenames extension. Moreover the extension was introduced in this cycle
only. Let's mark this extension EXPERIMENTAL for now so that we can change
things especially the storage layer if required in next cycle.

I will like to use cbor at storage layer too.

Differential Revision: https://phab.mercurial-scm.org/D3426

hgext/remotenames.py

@@ -6,7 +6,7 b''
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-""" showing remotebookmarks and remotebranches in UI
+""" showing remotebookmarks and remotebranches in UI (EXPERIMENTAL)
 
 By default both remotebookmarks and remotebranches are turned on. Config knob to
 control the individually are as follows.

tests/test-help.t

@@ -278,7 +278,6 b' Test extension help:'
        purge         command to delete untracked files from the working
                      directory
        relink        recreates hardlinks between repository clones
-       remotenames   showing remotebookmarks and remotebranches in UI
        schemes       extend schemes with shortcuts to repository swarms
        share         share a common history between several working directories
        shelve        save and restore changes to the working directory