Bump sphinxcontrib-serializinghtml from 1.1.5 to 2.0.0 in /docs #1709

Job	Run time
build-and-test / build-scala	5m 4s
build-and-test / arrow-tests / unit-tests	56s
build-and-test / cassandra-tests / unit-tests	1m 15s
build-and-test / accumulo-other-tests / unit-tests	5m 35s
build-and-test / accumulo-ds-tests / unit-tests	7m 3s
build-and-test / convert-tests / unit-tests	1m 52s
build-and-test / cqengine-tests / unit-tests	1m 25s
build-and-test / fs-tests / unit-tests	4m 21s
build-and-test / features-tests / unit-tests	1m 11s
build-and-test / gt-tests / unit-tests	1m 25s
build-and-test / hbase-tests / unit-tests	3m 5s
build-and-test / integration-tests / integration-tests	5m 17s
build-and-test / kafka-tests / unit-tests	2m 28s
build-and-test / lambda-tests / unit-tests	2m 46s
build-and-test / metrics-tests / unit-tests	31s
build-and-test / other-tests / unit-tests	1m 48s
build-and-test / process-tests / unit-tests	1m 5s
build-and-test / redis-tests / unit-tests	1m 9s
build-and-test / spark-tests / unit-tests	2m 26s
build-and-test / utils-tests / unit-tests	1m 5s
	51m 47s

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