Remove backticks from help in role commands

the docs and code had inconsistencies with how it
references other arguments, lets just remove the
backticks from around them.

Change-Id: I43d17b07364e45387c6b9d86c2aca26eeea8ed93

Author: Hidekazu Nakamura

doc/source/command-objects/role.rst

@@ -20,21 +20,21 @@ Add role to a user or group in a project or domain
 
 .. option:: --domain <domain>
 
-    Include `<domain>` (name or ID)
+    Include <domain> (name or ID)
 
     .. versionadded:: 3
 
 .. option:: --project <project>
 
-    Include `<project>` (name or ID)
+    Include <project> (name or ID)
 
 .. option:: --user <user>
 
-    Include `<user>` (name or ID)
+    Include <user> (name or ID)
 
 .. option:: --group <group>
 
-    Include `<group>` (name or ID)
+    Include <group> (name or ID)
 
     .. versionadded:: 3
 
@@ -67,7 +67,7 @@ Add role to a user or group in a project or domain
 
 .. describe:: <role>
 
-    Role to add to `<project>`:`<user>` (name or ID)
+    Role to add to <project>:<user> (name or ID)
 
 role create
 -----------
@@ -186,21 +186,21 @@ Remove role from domain/project : user/group
 
 .. option:: --domain <domain>
 
-    Include `<domain>` (name or ID)
+    Include <domain> (name or ID)
 
     .. versionadded:: 3
 
 .. option:: --project <project>
 
-    Include `<project>` (name or ID)
+    Include <project> (name or ID)
 
 .. option:: --user <user>
 
-    Include `<user>` (name or ID)
+    Include <user> (name or ID)
 
 .. option:: --group <group>
 
-    Include `<group>` (name or ID)
+    Include <group> (name or ID)
 
     .. versionadded:: 3
 

openstackclient/identity/v3/role.py

@@ -39,7 +39,7 @@ def _add_identity_and_resource_options_to_parser(parser):
     domain_or_project.add_argument(
         '--project',
         metavar='<project>',
-        help='Include `<project>` (name or ID)',
+        help='Include <project> (name or ID)',
     )
     user_or_group = parser.add_mutually_exclusive_group()
     user_or_group.add_argument(