Update documentation of McpJsonUtilities.DefaultOptions. #351

Job	Run time
build (ubuntu-latest, Debug)	2m 19s
build (ubuntu-latest, Release)	2m 45s
build (windows-latest, Debug)	5m 30s
build (windows-latest, Release)	6m 5s
build (macos-latest, Debug)	1m 29s
build (macos-latest, Release)	2m 1s
publish-coverage / publish-coverage	39s
	20m 48s

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