Document install_python_apt option of apt_repository (#72959)

* Update lib/ansible/modules/apt_repository.py
* Remove unnecessary ignored sanity tests
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Alicia Cozine <879121+acozine@users.noreply.github.com>
Co-authored-by: Amin Vakil <info@aminvakil.com>

lib/ansible/modules/apt_repository.py

@@ -78,6 +78,16 @@ options:
               a non-Ubuntu target (for example, Debian or Mint).
         type: str
         version_added: '2.3'
+    install_python_apt:
+        description:
+            - Whether to automatically try to install the Python apt library or not, if it is not already installed.
+              Without this library, the module does not work.
+            - Runs C(apt-get install python-apt) for Python 2, and C(apt-get install python3-apt) for Python 3.
+            - Only works with the system Python 2 or Python 3. If you are using a Python on the remote that is not
+               the system Python, set I(install_python_apt=false) and ensure that the Python apt library
+               for your Python version is installed some other way.
+        type: bool
+        default: true
 author:
 - Alexander Saltanov (@sashka)
 version_added: "0.7"

test/sanity/ignore.txt

@@ -73,10 +73,7 @@ lib/ansible/module_utils/urls.py pylint:blacklisted-name
 lib/ansible/module_utils/urls.py replace-urlopen
 lib/ansible/modules/apt.py validate-modules:parameter-invalid
 lib/ansible/modules/apt_key.py validate-modules:parameter-type-not-in-doc
-lib/ansible/modules/apt_repository.py validate-modules:doc-default-does-not-match-spec
 lib/ansible/modules/apt_repository.py validate-modules:parameter-invalid
-lib/ansible/modules/apt_repository.py validate-modules:parameter-type-not-in-doc
-lib/ansible/modules/apt_repository.py validate-modules:undocumented-parameter
 lib/ansible/modules/assemble.py validate-modules:nonexistent-parameter-documented
 lib/ansible/modules/async_status.py use-argspec-type-path
 lib/ansible/modules/async_status.py validate-modules!skip