Add some missing doccomments #3112

Job	Run time
.NET unit tests (ubuntu-latest)	2m 59s
.NET unit tests (windows-2022)	10m 53s
Build all projects without errors	8m 38s
.NET unit tests (macOS-latest)	5m 28s
Build published projects without warnings (Release)	2m 49s
Build published projects without warnings (Debug)	5m 18s
JS unit tests	58s
UI tests (chrome, ubuntu-latest, Production, Default)	13m 42s
UI tests (chrome, windows-2022, Development, Default)	22m 0s
UI tests (firefox, ubuntu-latest, Development, Default)	18m 58s
UI tests (firefox, ubuntu-latest, Production, Default)	18m 14s
UI tests (firefox, ubuntu-latest, Development, ExperimentalFeaturesTests)	19m 11s
UI tests (chrome, ubuntu-latest, Production, ExperimentalFeaturesTests)	14m 48s
	2h 23m 56s

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