Update javadoc to 8 and 11#3454

Merged

parrt merged 2 commits intoantlr:masterfrom

parrt:update-javadoc-to-8-and-11

Jan 2, 2022

Commits on Jan 2, 2022

no need for plugin in runtime, always gen svg from dot for javadoc, gen 1.8 not 1.7 doc for runtime. Gen 11 for tool.
parrt
committed
tweak doc for 1.8 runtime. Test rig should gen 1.8 not 1.7
parrt
committed