Extend release notes a bit.
Merge topic 'release-notes-3.0' into next

623ee635 Extend release notes a bit.
Join sentences.
Merge topic 'extend-docs' into next

b2e58fd9 Join sentences.
Help: Document SYSTEM treatment of IMPORTED target INTERFACE_INCLUDE_DIRS

Document how the behavior can be controlled.
Help: Add additional hyperlink targets
Merge topic 'extend-docs' into next

39d08b92 Help: Add additional hyperlink targets
ef17e293 Help: Document SYSTEM treatment of IMPORTED target INTERFACE_INCLUDE_DIRS