Ruby: Build

Document MaD barriers and barrier guards and add change notes #7996

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Run time

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Job	Run time
build (macos-latest)	39s
build (windows-latest)	43s
compile-queries	59s
build (ubuntu-latest)	20s
package	24s
test (ubuntu-latest)	2m 46s
test (macos-latest)	3m 36s
test (windows-latest)	4m 2s
	13m 29s