Remove "keywords" field in DOCUMENTATION.

This doesn't seem to be used by config although it came in with the
config PR.  It's not displayed in docs.  Removing it as this is the only
place where it's present.

lib/ansible/plugins/connection/winrm.py

@@ -27,9 +27,6 @@ DOCUMENTATION = """
             - name: ansible_winrm_host
         type: str
       remote_user:
-        keywords:
-          - name: user
-          - name: remote_user
         description:
             - The user to log in as to the Windows machine
         vars:
@@ -51,8 +48,6 @@ DOCUMENTATION = """
           - name: ansible_port
           - name: ansible_winrm_port
         default: 5986
-        keywords:
-          - name: port
         type: integer
       scheme:
         description: