Lookup docs (#30280)

* finalize lookup documentation
* minor fixes to ansible-doc
 - actually show which file caused error on when listing plugins
 - removed redundant display of type and name
* smart quote fixes from toshio

lib/ansible/plugins/lookup/list.py

@@ -1,24 +1,32 @@
-# (c) 2012-15, Ansible, Inc
-#
-# This file is part of Ansible
-#
-# Ansible is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# Ansible is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
+# (c) 2012-17 Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 # Make coding more python3-ish
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
+DOCUMENTATION = """
+    lookup: list
+    author: Ansible core team
+    version_added: "2.0"
+    short_description: simply returns what it is given.
+    description:
+      - this is mostly a noop, to be used as a with_list loop when you dont want the content transformed in any way.
+"""
+
+EXAMPLES = """
+- name: unlike with_items you will get 3 items from this loop, the 2nd one being a list
+  debug: var=item
+  with_list:
+    - 1
+    - [2,3]
+    - 4
+"""
+
+RETURN = """
+  _list:
+    description: basically the same as you fed in
+"""
 from ansible.plugins.lookup import LookupBase