doc: config intro, add link to searched locations (#39614)

docs/docsite/rst/installation_guide/intro_configuration.rst

@@ -17,6 +17,7 @@ Configuration file
 
 Certain settings in Ansible are adjustable via a configuration file (ansible.cfg).
 The stock configuration should be sufficient for most users, but there may be reasons you would want to change them.
+Paths where configuration file is searched are listed in :ref:`reference documentation<ansible_configuration_settings_locations>`.
 
 .. _getting_the_latest_configuration:
 

docs/templates/config.rst.j2

@@ -13,6 +13,7 @@ Ansible supports a few ways of providing configuration variables, mainly through
 Starting at Ansible 2.4 the ``ansible-config`` utility allows users to see all the configuration settings available, their defaults, how to set them and
 where their current value comes from. See :doc:ansible-config for more information.
 
+.. _ansible_configuration_settings_locations:
 
 The configuration file
 ======================