Bump rexml from 3.2.8 to 3.3.6 in /docs #2028

Job	Run time
build	4m 14s
integration-test (ubuntu-latest, 8)	2m 16s
test (ubuntu-latest, 8)	6m 49s
integration-test (ubuntu-latest, 11)	2m 11s
test (ubuntu-latest, 11)	4m 41s
integration-test (ubuntu-latest, 17)	1m 56s
test (ubuntu-latest, 17)	4m 37s
integration-test (macos-latest, 8)	2m 35s
test (macos-latest, 8)	6m 43s
integration-test (macos-latest, 11)	1m 59s
test (macos-latest, 11)	4m 37s
integration-test (macos-latest, 17)	2m 4s
test (macos-latest, 17)	3m 52s
integration-test (windows-latest, 8)	2m 46s
test (windows-latest, 8)	8m 7s
integration-test (windows-latest, 11)	2m 44s
test (windows-latest, 11)	6m 8s
integration-test (windows-latest, 17)	2m 47s
test (windows-latest, 17)	5m 47s
	1h 16m 53s

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