javadoc for QueryResultSet #6974

Job	Run time
setup	1s
test-utils-py	13s
test-utils-js	15s
base-build-mac	19m 56s
base-build-windows	6m 34s
debug	0s
bb-on-different-os (windows-latest)	23m 21s
full-build-base	3h 14m 50s
bb-on-different-os (macos-latest)	1h 8m 19s
full-build-LTS	2h 38m 49s
installer-for-osx	3m 30s
installer-for-windows	1m 23s
installer-for-debian	1m 58s
	7h 59m 9s

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