Bug 1734028 - Update GeckoView Contributor Guide r=geckoview-reviewers,agi,calu

Differential Revision: https://phabricator.services.mozilla.com/D127493

mobile/android/docs/geckoview/contributor/geckoview-quick-start.rst

@@ -25,8 +25,10 @@ in ``mozilla-central``. You will need to get set up as a contributor to
 Firefox in order to contribute to GeckoView. To get set up with
 ``mozilla-central``, follow the `Quick Start Guide for Git
 Users <mc-quick-start.html>`_, or the `Contributing to the Mozilla code
-base <https://developer.mozilla.org/docs/Mozilla/Developer_guide/Introduction>`_
-guide on `MDN <https://developer.mozilla.org/>`_ for Mercurial users.
+base <https://firefox-source-docs.mozilla.org/setup/contributing_code.html>`_
+guide and `Firefox Contributors’ Quick Reference
+<https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html>`_
+for Mercurial users.
 
 Once you have a copy of ``mozilla-central``, you will need to build
 GeckoView.
@@ -83,15 +85,6 @@ Build Using Android Studio
 
 -  Install `Android
    Studio <https://developer.android.com/studio/install>`_.
--  Disable Instant Run. This is because Fennec and the Geckoview Example
-   app cannot deploy with Instant Run on.
-
-   -  Select Android Studio > Preferences from the menu bar
-   -  Navigate to Build, Execution, Deployment > Instant Run.
-   -  Uncheck the box that reads
-      ``Enable Instant Run to hot swap code/resource changes on deploy``.
-
-   |alt text|
 -  Choose File->Open from the toolbar
 -  Navigate to the root of your ``mozilla-central`` source directory and
    click “Open”
@@ -103,17 +96,12 @@ Build Using Android Studio
 -  Wait for the project to index and gradle to sync. Once synced, the
    workspace will reconfigure to display the different projects.
 
-   -  annotations contains custom annotations used inside GeckoView and
-      Fennec.
-   -  app is Fennec - Firefox for Android. Here is where you will find
-      code specific to that app.
+   -  annotations contains custom Java annotations used inside GeckoView
+   -  app contains geckoview build settings and omnijar. omnijar contains
+      the parts of Gecko and GeckoView that are not written in Java or Kotlin
    -  geckoview is the GeckoView project. Here is all the Java files
       related to GeckoView
    -  geckoview_example is an example browser built using GeckoView.
-   -  omnijar contains the parts of Gecko and GeckoView that are not
-      written in Java or Kotlin
-   -  thirdparty contains third party code that Fennec and GeckoView
-      use.
 
    |alt text 1|