standardize connection variable names (#51776)

* standardize user/password connection vars

* docs: use ansible_user and ansible_password

* docs: var precedence for connection vars

* docs: ansible_become_pass -> ansible_become_password etc

lib/ansible/plugins/connection/network_cli.py

@@ -63,6 +63,7 @@ options:
     vars:
       - name: ansible_password
       - name: ansible_ssh_pass
+      - name: ansible_ssh_password
   private_key_file:
     description:
       - The private SSH key or certificate file used to authenticate to the