Update shell.py (#44477)

* Update shell.py

<!--- Your description here -->
Add example for disabling warnings to shell module
+label: docsite_pr

* Fix PEP8 issues

lib/ansible/modules/commands/shell.py

@@ -119,6 +119,12 @@ EXAMPLES = '''
   args:
     executable: /usr/bin/expect
   delegate_to: localhost
+
+# Disabling warnings
+- name: Using curl to connect to a host via SOCKS proxy (unsupported in uri). Ordinarily this would throw a warning.
+  shell: curl --socks5 localhost:9000 http://www.ansible.com
+  args:
+    warn: False
 '''
 
 RETURN = '''