This commit adds the information that the manual recovery procedure is not supported if tablets are enabled. In addition, the content in the Manual Recovery Procedure is reorganized by adding the Prerequisites and Procedure subsections - in this way, we can limit the number of Note and Warning boxes that made the page hard to follow. Fixes https://github.com/scylladb/scylladb/issues/18895 Closes scylladb/scylladb#18935