Update Query Group API descriptions (#674) #1561

Job	Run time
test-opensearch-spec (version=1.3.17, hub=opensearchproject, tests=default)	1m 19s
test-opensearch-spec (version=2.0.0, hub=opensearchproject, tests=default)	1m 19s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=default)	1m 51s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/index_state_management)	57s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/ml)	1m 53s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=routing)	1m 26s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=snapshot)	1m 1s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/streaming)	1m 4s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/notifications)	1m 0s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/query_insights)	55s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/workload-management)	1m 0s
test-opensearch-spec (version=2.18.0, hub=opensearchproject, tests=plugins/analysis)	1m 10s
test-opensearch-spec (version=2.19.0, hub=opensearchstaging, tests=default)	1m 47s
test-opensearch-spec (version=3.0.0, hub=opensearchstaging, tests=default)	1m 54s
merge-coverage	10s
	18m 46s

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