[docs] Minor improvements

docs/developer/extending.rst

@@ -17,9 +17,9 @@ serve you as source of truth: just replicate and adapt that code to get a basic
 derivative of *OpenWISP Controller* working.
 
 If you want to add new users fields, please follow the :doc:`tutorial to extend the
-openwisp-users module </users/developer/extending>`. As an
-example, we have extended *openwisp-users* to *sample_users* app and added a field
-``social_security_number`` in the `sample_users/models.py
+openwisp-users module </users/developer/extending>`. As an example, we have extended
+*openwisp-users* to *sample_users* app and added a field ``social_security_number`` in
+the `sample_users/models.py
 <https://github.com/openwisp/openwisp-controller/blob/master/tests/openwisp2/sample_users/models.py>`_.
 
 **Premise**: if you plan on using a customized version of this module, we suggest to

docs/developer/utils.rst

@@ -75,10 +75,10 @@ For more information, see the relevant :doc:`documentation section about registe
 notification types in the Notifications module
 </notifications/developer/utils>`.
 
-Once a new notification type is registered, you have to use the :doc:`"notify" signal
-provided the Notifications module
-</notifications/user/sending-notifications>` to send
-notifications for this type.
+Once a new notification type is registered, you can use
+the :doc:`"notify" signal provided by the Notifications module
+</notifications/user/sending-notifications>` to send notifications
+with this new type.
 
 Signals
 -------

docs/user/intro.rst

@@ -79,8 +79,8 @@ SNMP
 ~~~~
 
 The SNMP connector is useful to collect monitoring information and it's used in
-:doc:`OpenWISP Monitoring </monitoring/index>` for performing
-checks to collect monitoring information. `Read more
+:doc:`OpenWISP Monitoring </monitoring/index>` for performing checks to collect
+monitoring information. `Read more
 <https://github.com/openwisp/openwisp-monitoring/pull/309#discussion_r692566202>`_ on
 how to use it.