[PATCH STABLE] shelve: lowercase flag description

[timeless]

# HG changeset patch
# User timeless <timeless at mozdev.org>
# Date 1453335619 0
#      Thu Jan 21 00:20:19 2016 +0000
# Branch stable
# Node ID 6a3e4dc507deab79b700aa0726c3e45eff99664d
# Parent  5f2a308bac94b72453e0147d59edae23509f9dd4
shelve: lowercase flag description

The help for --unknown is the *only* command that started with a capital letter

diff --git a/hgext/shelve.py b/hgext/shelve.py
--- a/hgext/shelve.py
+++ b/hgext/shelve.py
@@ -766,7 +766,7 @@
          [('A', 'addremove', None,
            _('mark new/missing files as added/removed before shelving')),
           ('u', 'unknown', None,
-           _('Store unknown files in the shelve')),
+           _('store unknown files in the shelve')),
           ('', 'cleanup', None,
            _('delete all shelved changes')),
           ('', 'date', '',