Fix doc formatting.
Make staff debug info code to be always LTR
change ItemNotFoundErrors to log.warning in x_module.py
show warning on navigate away from import page only for first two stages
TNL-554
Add a test for donations with a white-label course mode
Merge pull request #5557 from edx/jeskew/minor_xblock_doc_edit

Fix XBlock doc formatting. No content change! Only formatting...
Merge pull request #5730 from edx/will/update-donation-tests

Add a test for donations with a white-label course mode
Migrate exercises and tools to shared folder
Merge pull request #5746 from edx/sylvia/docs/prob_migration

Migrate exercises and tools to shared folder
Replace index file
Merge pull request #5748 from edx/sylvia/docs/prob_correct

Replace index file
Fixed upload button on high level source editing popup.
TNL-222
Merge pull request #5734 from edx/waheed/tnl222-fix-upload-button-on-high-level-source-edit

Fixed upload button on high level source editing popup.
Merge pull request #5699 from Edraak/staff-debug-info-ltr-code

Make staff debug info code to be always LTR
Correct doc link
Merge pull request #5658 from edx/zub/bugfix/tnl-554-conflictingimportmessages

show warning on navigate away from import page only for first two stages
Merge pull request #5758 from edx/correct-doc-link

Correct doc link
Merge pull request #5345 from edx/adam/adjust-logging-level

change ItemNotFoundErrors to log.warning on bringup
Fix case of y coords in Drag & Drop template

Change from uppercase to lowercase “Y”