Implemented several improvements to share migration in documentation
according to https://review.opendev.org/#/c/406305/
Summary of changes:
- Add driver-assisted mandatory parameters.
- Removed previous API documentation because support for them isn't
there anymore after the backwards incompatible changes were
made via https://review.opendev.org/#/c/406305/.
- Add force-host-assisted migration.
Change-Id: I6d446b4037a3a9991e375f0a8bfb1f6edce09c1f
Closes-Bug: #1658230