Document default value for UseStructuredContent. (#539) #497

Job	Run time
build (macos-latest, Release)	1m 57s
build (windows-latest, Debug)	4m 39s
build (ubuntu-latest, Debug)	2m 21s
build (ubuntu-latest, Release)	3m 28s
build (windows-latest, Release)	4m 41s
build (macos-latest, Debug)	2m 19s
publish-coverage / publish-coverage	32s
	19m 57s

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