feat: add backbone workaround to troubleshooting guide (#1086)

Author: Rebecca Graber

docs/troubleshoot_general_tips.rst

@@ -230,3 +230,11 @@ The fix is to get a new auth session. You can do any of the following:
 3. Refresh http://localhost:18000
 4. Log in
 5. Navigate back to the MFE
+
+Missing vendor file node_modules/backbone.paginator/lib/backbone.paginator.js
+-----------------------------------------------------------------------------
+This message sometimes appears when provisioning. The root cause of this is as yet unknown but the most effective workaround seems to be
+to shell into the LMS (``make lms-shell`` in devstack) and run ``npm ci``, followed by ``paver update_assets``.
+See `the github issue`_ to follow the work being done on the resolution.
+
+.. _the github issue: https://github.com/openedx/devstack/issues/1072