ini_file: removing required=true for 'section' option (#6404)

Fix ini_file by removing required=true for 'section' option.

changelogs/fragments/6404-ini_file-section.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "ini_file - make ``section`` parameter not required so it is possible to pass ``null`` as a value. This only was possible in the past due to a bug in ansible-core that now has been fixed (https://github.com/ansible-collections/community.general/pull/6404)."

plugins/modules/ini_file.py

@@ -42,10 +42,9 @@ options:
     description:
       - Section name in INI file. This is added if I(state=present) automatically when
         a single value is being set.
-      - If left empty or set to C(null), the I(option) will be placed before the first I(section).
+      - If left empty, being omitted, or being set to C(null), the I(option) will be placed before the first I(section).
       - Using C(null) is also required if the config format does not support sections.
     type: str
-    required: true
   option:
     description:
       - If set (required for changing a I(value)), this is the name of the option.
@@ -430,7 +429,7 @@ def main():
     module = AnsibleModule(
         argument_spec=dict(
             path=dict(type='path', required=True, aliases=['dest']),
-            section=dict(type='str', required=True),
+            section=dict(type='str'),
             option=dict(type='str'),
             value=dict(type='str'),
             values=dict(type='list', elements='str'),