Fix titlecase

Author: cbush

source/tutorial.txt

@@ -44,7 +44,7 @@ functions, and triggers to integrate with GitHub and MongoDB:
    :caption: 1: Setup
    :hidden:
 
-   Set Up the Backend </tutorial/realm-app>
+   Set up the Backend </tutorial/realm-app>
 
 .. toctree::
    :titlesonly:

source/tutorial/android-kotlin.txt

@@ -43,7 +43,7 @@ Before you begin, ensure you have:
 - An Android emulator for testing.
 - :ref:`Set up the backend <tutorial-task-tracker-create-realm-app>`.
 
-Set Up the Mobile App
+Set up the Mobile App
 ---------------------
 
 .. include:: /includes/steps/tutorial-android-kotlin.rst

source/tutorial/ios-swift.txt

@@ -44,7 +44,7 @@ Before you begin, ensure you have:
 - `CocoaPods <https://guides.cocoapods.org/using/getting-started.html>`__ 1.6.0 or later.
 - :ref:`Set up the backend <tutorial-task-tracker-create-realm-app>`.
 
-Set Up the Mobile App
+Set up the Mobile App
 ---------------------
 
 .. include:: /includes/steps/tutorial-ios-swift.rst

source/tutorial/react-native.txt

@@ -51,7 +51,7 @@ Ensure that you have the following:
 
 - :ref:`Set up the backend <tutorial-task-tracker-create-realm-app>`.
 
-Set Up the Mobile App
+Set up the Mobile App
 ---------------------
 
 .. include:: /includes/steps/tutorial-react-native.rst

source/tutorial/realm-app.txt

@@ -1,7 +1,7 @@
 .. _tutorial-task-tracker-create-realm-app:
 
 ========================================
-Set Up the Task Tracker Tutorial Backend
+Set up the Task Tracker Tutorial Backend
 ========================================
 
 .. default-domain:: mongodb

source/tutorial/web-graphql.txt

@@ -63,7 +63,7 @@ Prerequisites
 Before you get started, you'll need the following:
 
 - A complete task tracker app in MongoDB Realm. If you haven't yet completed
-  :doc:`Set Up the Task Tracker Tutorial Backend </tutorial/realm-app>`, do
+  :doc:`Set up the Task Tracker Tutorial Backend </tutorial/realm-app>`, do
   that before you continue.
 
 - :nodejs:`Node.js <>` installed on your machine.