Fix liquid formatting for OS versioning

Author: ethanpalm

data/reusables/desktop/click-changed-files-header.md

@@ -1,7 +1,13 @@
 1. Right click the **changed files** header.
+  
   {% mac %}
+
   ![The changed files header](/assets/images/help/desktop/mac-changed-file-header.png)
+  
   {% endmac %}
+  
   {% windows %}
+  
   ![The changed files header](/assets/images/help/desktop/windows-changed-file-header.png)
+  
   {% endwindows %}

data/reusables/desktop/click-stash-all-changes.md

@@ -1,7 +1,13 @@
 1. Click **Stash All Changes**.
+  
   {% mac %}
+
   ![The Stash All Changes menu item](/assets/images/help/desktop/mac-stash-all-changes.png)
+  
   {% endmac %}
+  
   {% windows %}
+  
   ![The Stash all changes menu item](/assets/images/help/desktop/windows-stash-all-changes.png)
+  
   {% endwindows %}