Fix the problem of router delete

Change "Remove" to "Delete" when using it in route-interface-delete.

Change-Id: I9ebc38c787acbcb42d2f8efeee41f6cb943e4b9b
Related-bug: #1560446

Author: SongmingYan

doc/source/command-objects/router.rst

@@ -150,7 +150,7 @@ Remove a port from a router
 
 .. describe:: <port>
 
-    Port to be removed (name or ID)
+    Port to be removed and deleted (name or ID)
 
 router remove subnet
 --------------------

openstackclient/network/v2/router.py

@@ -309,7 +309,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'port',
             metavar='<port>',
-            help=_("Port to be removed (name or ID)")
+            help=_("Port to be removed and deleted (name or ID)")
         )
         return parser