Clean up nmcli docs (#33596)

This patch cleans up the documentation for `nmcli` module.

lib/ansible/modules/net_tools/nmcli.py

@@ -465,9 +465,10 @@ EXAMPLES='''
       type: ethernet
       state: present
 
-# Exit Status's:
+# nmcli exits with status 0 if it succeeds and exits with a status greater
-#     - nmcli exits with status 0 if it succeeds, a value greater than 0 is
+# than zero when there is a failure. The following list of status codes may be
-#     returned if an error occurs.
+# returned:
+#
 #     - 0 Success - indicates the operation succeeded
 #     - 1 Unknown or unspecified error
 #     - 2 Invalid user input, wrong nmcli invocation