Fix list indent in validation.md.

Author: junhaoliao

docs/dev-guide/validation.md

@@ -4,13 +4,13 @@ Currently, there is no automated testing in place. While automation is being con
 development, the following tests should be performed manually:
 
 * Verify that the following features work:
-    * Changing display themes
-    * Changing the number of events per page
-    * Navigating to the first/last/next/previous page
-    * Loading a log file using the open file dialog and dragging & dropping
-    * Copying a link to a log event
-    * Changing the log level filter
-    * Exporting all logs to a file
-    * Toggling tabbed panels in the sidebar
-    * Using keyboard shortcuts
+  * Changing display themes
+  * Changing the number of events per page
+  * Navigating to the first/last/next/previous page
+  * Loading a log file using the open file dialog and dragging & dropping
+  * Copying a link to a log event
+  * Changing the log level filter
+  * Exporting all logs to a file
+  * Toggling tabbed panels in the sidebar
+  * Using keyboard shortcuts
 * Perform a build and verify that all features are functional