Adjust YAML in plugin docs (#10234)

* Adjust YAML in plugin docs.

* Update ignore.txt.

* Forgot two indents.

* adjust connection plugins
adjust filter plugins
adjust inventory plugins
adjust lookup plugins

* Re-add YAML document start.

---------

Co-authored-by: Alexei Znamensky <russoz@gmail.com>

plugins/inventory/iocage.py

@@ -6,7 +6,7 @@
 
 from __future__ import annotations
 
-DOCUMENTATION = r'''
+DOCUMENTATION = r"""
 name: iocage
 short_description: iocage inventory source
 version_added: 10.2.0
@@ -110,9 +110,9 @@ notes:
     expects to find the O(hooks_results) items in the path
     C(/iocage/iocage/jails/<name>/root). If you mount the C(poolname) to a
     different path the easiest remedy is to create a symlink.
-'''
+"""
 
-EXAMPLES = r'''
+EXAMPLES = r"""
 ---
 # file name must end with iocage.yaml or iocage.yml
 plugin: community.general.iocage
@@ -182,7 +182,7 @@ compose:
   ansible_host: iocage_hooks.0
 groups:
   test: inventory_hostname.startswith('test')
-'''
+"""
 
 import re
 import os