Update plugin filter documentation (#46665)

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

docs/docsite/rst/user_guide/plugin_filtering_config.rst

@@ -5,7 +5,8 @@ Plugin Filter Configuration
 
 Ansible 2.5 adds the ability for a site administrator to blacklist modules that they do not want to
 be available to Ansible. This is configured via a yaml configuration file (by default,
-:file:`/etc/ansible/plugin_filters.yml`). The format of the file is:
+:file:`/etc/ansible/plugin_filters.yml`). Use ``plugin_filters_cfg`` configuration
+in ``defaults`` section to change this configuration file path. The format of the file is:
 
 .. code-block:: YAML
 
@@ -20,7 +21,11 @@ be available to Ansible. This is configured via a yaml configuration file (by de
 The file contains two fields:
 
 * a version so that it will be possible to update the format while keeping backwards
-  compatibility in the future   The present version should be the string, ``"1.0"``
+  compatibility in the future. The present version should be the string, ``"1.0"``
 
 * a list of modules to blacklist.  Any module listed here will not be found by Ansible when it
   searches for a module to invoke for a task.
+
+.. note::
+
+    The ``stat`` module is required for Ansible to run. So, please make sure you do not add this module in a blacklist modules list.