fix keypair help msg

keypair delete and keypair show commands cannot work on keypair ID

Change-Id: I958fcd2ed184706b28d63cc9c73a8b566e86a16c
Closes-Bug:#1588701

Author: sunyajing

doc/source/command-objects/keypair.rst

@@ -40,7 +40,7 @@ Delete public key
 
 .. describe:: <key>
 
-    Public key to delete
+    Public key to delete (name only)
 
 keypair list
 ------------
@@ -66,7 +66,7 @@ Display public key details
 
 .. option:: --public-key
 
-    Show only bare public key
+    Show only bare public key (name only)
 
 .. describe:: <key>
 

openstackclient/compute/v2/keypair.py

@@ -84,7 +84,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'name',
             metavar='<key>',
-            help=_("Public key to delete")
+            help=_("Public key to delete (name only)")
         )
         return parser
 
@@ -118,7 +118,7 @@ def get_parser(self, prog_name):
         parser.add_argument(
             'name',
             metavar='<key>',
-            help=_("Public key to display")
+            help=_("Public key to display (name only)")
         )
         parser.add_argument(
             '--public-key',