whitespace before every major heading

doc/user-guide/user-guide.md

 # VideoStitch Studio User Guide
 
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 **Table of contents**
 - [Getting started with VideoStitch Studio](#getting-started-with-videostitch-studio)
   * [Starting a new project](#starting-a-new-project)
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     + [Working with VideoStitch Studio - Troubleshooting](#working-with-videostitch-studio---troubleshooting)
     + [Keyboard shortcuts](#keyboard-shortcuts)
 
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 # Getting started with VideoStitch Studio
 
 ## Starting a new project
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 ![Media in Source](Images/Media%20in%20Source.jpg)
 
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 # VideoStitch Studio user interface
 
 ## VideoStitch Studio panels
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 ![Bottom Information](Images/Bottom%20Information.jpg)
 
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 # VideoStitch Studio workflow
 
 ## Synchronization
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 ![Batch Stitcher](Images/Batch%20Stitcher.jpg)
 
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 # Useful Tips & Troubleshooting
 
 ### Building your own 360° camera rig