We should rework the old content Chapter 5 from EAP 8.0 Migration Guide, and add it to EAP 8.1 Migration Guide Chapter 6.

• We move whole chapter 6 content to 6.1 (i.e. 6.1 becomes 6.1.1, 6.2 becomes 6.1.2)
• We recover the old 8.0 content, so we cover 7.4 to 8.1 (the beta content is only about 8.0 to 8.1)

Draft for doc update available at https://docs.google.com/document/d/1huOARLGRfq34OprHRai04ZI_b7JgdRLbFygslCleQd8/edit?usp=sharing