Rename troubleshooting docs page

docs/topics/overview.rst

@@ -12,5 +12,5 @@ Introductions to all the key parts of CloudBridge you'll need to know:
     Object states and lifecycles <object_lifecycles.rst>
     Paging and iteration <paging_and_iteration.rst>
     Using block storage <block_storage.rst>
-    Common setup issues <common_setup_issues.rst>
+    Troubleshooting <troubleshooting.rst>