Repair links to Non-Core documents

Author: Chris Jakeman

learn/documents/index.html

@@ -17,10 +17,10 @@ <h2>Using Core Open Rails</h2>
         </ul>
         <h2>Using Non-Core (Contributed) Programs</h2>
         <ul>
-          <li><a href="https://static.openrails.org/files/Content%20checker.pdf" target="_blank">Content Checker Manual</a></li>
-          <li><a href="https://static.openrails.org/files/timetable-editor_de.pdf" target="_blank">Timetable Editor (DE)</a></li>
-          <li><a href="https://static.openrails.org/files/timetable-editor_en.pdf" target="_blank">Timetable Editor (EN)</a></li>
-          <li><a href="https://static.openrails.org/files/ORTS_Trackviewer_manual.pdf" target="_blank">Trackviewer Manual</a></li>
+          <li><a href="https://static.openrails.org/files/OpenRails-Testing-Content%20checker.pdf" target="_blank">Content Checker Manual</a></li>
+          <li><a href="https://static.openrails.org/files/OpenRails-Testing-timetable-editor_de.pdf" target="_blank">Timetable Editor (DE)</a></li>
+          <li><a href="https://static.openrails.org/files/OpenRails-Testing-timetable-editor_en.pdf" target="_blank">Timetable Editor (EN)</a></li>
+          <li><a href="https://static.openrails.org/files/OpenRails-Testing-ORTS%20Trackviewer%20manual.pdf" target="_blank">Trackviewer Manual</a></li>
         </ul>
         <h2>Simulation Documents</h2>
         <ul>