[docs] Minor fixes

[skip ci]

docs/developer/extending.rst

@@ -202,9 +202,11 @@ Then, run the migrations:
 
     ./manage.py migrate
 
-**Note**: the ``0004_default_groups`` is required because other OpenWISP
-modules depend on it. If it's not created as documented here, the
-migrations of other OpenWISP modules will fail.
+.. note::
+
+    The ``0004_default_groups`` is required because other OpenWISP
+    modules depend on it. If it's not created as documented here, the
+    migrations of other OpenWISP modules will fail.
 
 10. Create the admin
 --------------------

docs/developer/index.rst

@@ -14,5 +14,5 @@ Developer Docs
 
 Other useful resources:
 
-    - :doc:`../user/rest-api`
-    - :doc:`../user/settings`
+- :doc:`../user/rest-api`
+- :doc:`../user/settings`

docs/user/basic-concepts.rst

@@ -192,8 +192,8 @@ via the administrative interface, even if they are flagged as Staff users.
 They can only consume REST API endpoints or other non administrative user
 interface pages.
 
-A real-world example of this is the `User API endpoints of OpenWISP RADIUS
-<https://openwisp-radius.readthedocs.io/en/stable/user/api.html#user-api-endpoints>`_,
+A real-world example of this is the :ref:`User API endpoints of OpenWISP RADIUS
+<radius_user_api_endpoints>`,
 which allow users to sign up to an organization, verify their phone number
 by receiving a verification code via SMS, see their RADIUS sessions, etc.
 All those endpoints are tied to an organization because different

docs/user/intro.rst

@@ -67,8 +67,8 @@ of Django third party apps to implement the following:
   like OAuth, SAML, MS Azure Authentication, etc.
 - Support multi-factor authentication (MFA).
 
-On a similar note, the `OpenWISP RADIUS
-<https://openwisp-radius.readthedocs.io/>`_ module ships logic that allows
+On a similar note, the :doc:`OpenWISP RADIUS
+</radius/index>` module ships logic that allows
 end-users to log into WiFi services using OAuth (e.g.: social login
 provided by Google, Facebook) or SAML (e.g.: `EIDAS
 <https://www.eid.as/>`_, `SPID <https://www.spid.gov.it/en/>`_).

docs/user/rest-api.rst

@@ -259,9 +259,11 @@ Create User
 
     POST /api/v1/users/user/
 
-**Note**: Passing ``true`` to the optional ``is_verified`` field allows
-creating users with their email address flagged as verified. This will
-also skip sending the verification link to their email address.
+.. note::
+
+    Passing ``true`` to the optional ``is_verified`` field allows
+    creating users with their email address flagged as verified. This will
+    also skip sending the verification link to their email address.
 
 Get User Detail
 ~~~~~~~~~~~~~~~