Docs: Edit list of locations to search for roles (#75703)

* Docs: Add playbook base dir to roles search

* Docs: Add link to default roles path

docs/docsite/rst/user_guide/playbooks_reuse_roles.rst

@@ -78,10 +78,12 @@ Roles may also include modules and other plugin types in a directory called ``li
 Storing and finding roles
 =========================
 
-By default, Ansible looks for roles in two locations:
+By default, Ansible looks for roles in the following locations:
 
+- in collections, if you are using them
 - in a directory called ``roles/``, relative to the playbook file
-- in ``/etc/ansible/roles``
+- in the configured :ref:`roles_path <DEFAULT_ROLES_PATH>`. The default search path is ``~/.ansible/roles:/usr/share/ansible/roles:/etc/ansible/roles``.
+- in the directory where the playbook file is located
 
 If you store your roles in a different location, set the :ref:`roles_path <DEFAULT_ROLES_PATH>` configuration option so Ansible can find your roles. Checking shared roles into a single location makes them easier to use in multiple playbooks. See :ref:`intro_configuration` for details about managing settings in ansible.cfg.