Clean up common module docs (#45888)

Some of the older modules have evolved documentation that does not
follow a consistent style. This is a clean-up in form and style.

lib/ansible/modules/commands/shell.py

@@ -1,7 +1,10 @@
-# Copyright: Ansible Project
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2018, Ansible Project
 # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
-# # There is no actual shell module source, when you use 'shell' in ansible,
+# There is no actual shell module source, when you use 'shell' in ansible,
 # it runs the 'command' module with special arguments and it behaves differently.
 # See the command source and the comment "#USE_SHELL".
 
@@ -14,47 +17,49 @@ ANSIBLE_METADATA = {'metadata_version': '1.1',
                     'supported_by': 'core'}
 
 
-DOCUMENTATION = '''
+DOCUMENTATION = r'''
 ---
 module: shell
-short_description: Execute commands in nodes.
+short_description: Execute shell commands on targets
 description:
      - The C(shell) module takes the command name followed by a list of space-delimited arguments.
-       It is almost exactly like the M(command) module but runs
+     - It is almost exactly like the M(command) module but runs
        the command through a shell (C(/bin/sh)) on the remote node.
      - For Windows targets, use the M(win_shell) module instead.
 version_added: "0.2"
 options:
   free_form:
     description:
-      - The shell module takes a free form command to run, as a string.  There's not an actual
-        option named "free form".  See the examples!
-    required: true
+      - The shell module takes a free form command to run, as a string.
+      - There is no actual parameter named 'free form'.
+      - See the examples on how to use this module.
+    required: yes
   creates:
     description:
-      - a filename, when it already exists, this step will B(not) be run.
+      - A filename, when it already exists, this step will B(not) be run.
   removes:
     description:
-      - a filename, when it does not exist, this step will B(not) be run.
+      - A filename, when it does not exist, this step will B(not) be run.
     version_added: "0.8"
   chdir:
     description:
-      - cd into this directory before running the command
+      - Change into this directory before running the command.
     version_added: "0.6"
   executable:
     description:
-      - change the shell used to execute the command. Should be an absolute path to the executable.
+      - Change the shell used to execute the command.
+      - This expects an absolute path to the executable.
     version_added: "0.9"
   warn:
     description:
-      - if command warnings are on in ansible.cfg, do not warn about this particular line if set to no/false.
+      - Enable or disable task warnings.
     type: bool
-    default: 'yes'
+    default: yes
     version_added: "1.8"
   stdin:
-    version_added: "2.4"
     description:
       - Set the stdin of the command directly to the specified value.
+    version_added: "2.4"
 notes:
   -  If you want to execute a command securely and predictably, it may be
      better to use the M(command) module instead. Best practices when writing
@@ -68,15 +73,12 @@ notes:
   -  To sanitize any variables passed to the shell module, you should use
      "{{ var | quote }}" instead of just "{{ var }}" to make sure they don't include evil things like semicolons.
   - For Windows targets, use the M(win_shell) module instead.
-  - Rather than using here documents to create multi-line scripts inside playbooks,
-    use the M(script) module instead.
-requirements: [ ]
 author:
     - Ansible Core Team
     - Michael DeHaan
 '''
 
-EXAMPLES = '''
+EXAMPLES = r'''
 - name: Execute the command in remote shell; stdout goes to the specified file on the remote.
   shell: somescript.sh >> somelog.txt
 
@@ -107,13 +109,13 @@ EXAMPLES = '''
     spawn ssh admin@{{ cimc_host }}
 
     expect "password:"
-    send "{{ cimc_password }}\\n"
+    send "{{ cimc_password }}\n"
 
-    expect "\\n{{ cimc_name }}"
-    send "connect host\\n"
+    expect "\n{{ cimc_name }}"
+    send "connect host\n"
 
     expect "pxeboot.n12"
-    send "\\n"
+    send "\n"
 
     exit 0
   args:
@@ -124,10 +126,10 @@ EXAMPLES = '''
 - 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
+    warn: no
 '''
 
-RETURN = '''
+RETURN = r'''
 msg:
     description: changed
     returned: always