Add version 12 upgrade recommendations
What does this MR do?
Upgrade recommendations contain suggested upgrade paths and examples, stopping with version 11.3.4
MR adds documentation for upgrade path to latest major version (12.x):
11.3.4
-> 11.11.x
-> 12.0.x
Fix #63907 (closed)
Does this MR meet the acceptance criteria?
Conformity
Edited by Greg Myers