Bug 1569472 - Fix Linting errors in toolkit/components/extensions/. r=sylvestre

Differential Revision: https://phabricator.services.mozilla.com/D54061

--HG--
extra : moz-landing-system : lando

toolkit/components/extensions/docs/background.rst

@@ -55,6 +55,7 @@ that is accessible from Javascript:
   in which of these environments the feature will be available.
   Most Javascript features are available in extension pages,
   other environments have limited sets of API features available.
+
 .. |getURL| replace:: ``browser.runtime.getURL()``
 .. _getURL: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/runtime/getURL
 

toolkit/components/extensions/docs/other.rst

@@ -1,19 +1,20 @@
 Utilities for implementing APIs
 ===============================
+
 This page covers some utility classes that are useful for
 implementing WebExtension APIs:
 
 WindowManager
 -------------
 This class manages the mapping between the opaque window identifiers used
-in the `browser.windows <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/windows>`_ API.
-See the reference docs `here <reference.html#windowmanager-class>`_.
+in the `browser.windows <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/windows>`__ API.
+See the reference docs `here <reference.html#windowmanager-class>`__.
 
 TabManager
 ----------
 This class manages the mapping between the opaque tab identifiers used
-in the `browser.tabs <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs>`_ API.
-See the reference docs `here <reference.html#tabmanager-class>`_.
+in the `browser.tabs <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/tabs>`__ API.
+See the reference docs `here <reference.html#tabmanager-class>`__.
 
 ExtensionSettingsStore
 ----------------------