[stable-4] Move in-plugin docs to sidecar for filters not named like the filename that contain them (#4626)

* Move in-plugin docs to sidecar for filters not named like the filename that contain them.

* Update BOTMETA.

plugins/filter/groupby.py

@@ -5,52 +5,6 @@
 from __future__ import (absolute_import, division, print_function)
 __metaclass__ = type
 
-DOCUMENTATION = '''
-  name: groupby_as_dict
-  short_description: Transform a sequence of dictionaries to a dictionary where the dictionaries are indexed by an attribute
-  version_added: 3.1.0
-  author: Felix Fontein (@felixfontein)
-  description:
-    - Transform a sequence of dictionaries to a dictionary where the dictionaries are indexed by an attribute.
-  positional: attribute
-  options:
-    _input:
-      description: A list of dictionaries
-      type: list
-      elements: dictionary
-      required: true
-    attribute:
-      description: The attribute to use as the key.
-      type: str
-      required: true
-'''
-
-EXAMPLES = '''
-- name: Arrange a list of dictionaries as a dictionary of dictionaries
-  ansible.builtin.debug:
-    msg: "{{ sequence | community.general.groupby_as_dict('key') }}"
-  vars:
-    sequence:
-      - key: value
-        foo: bar
-      - key: other_value
-        baz: bar
-  # Produces the following nested structure:
-  #
-  #  value:
-  #    key: value
-  #    foo: bar
-  #  other_value:
-  #    key: other_value
-  #    baz: bar
-'''
-
-RETURN = '''
-  _value:
-    description: A dictionary containing the dictionaries from the list as values.
-    type: dictionary
-'''
-
 from ansible.errors import AnsibleFilterError
 from ansible.module_utils.common._collections_compat import Mapping, Sequence