Document PSE fork features (#226) #777

Job	Run time
Intra-doc links	5m 47s
Build target wasm32-unknown-unknown	4m 10s
Bitrot check	5m 25s
Build target wasm32-wasi	4m 13s
Rustfmt	15s
Test on ubuntu-latest with basic features	9m 15s
Test on windows-latest with basic features	21m 31s
Test on macOS-latest with basic features	13m 3s
Test on ubuntu-latest with all features	11m 21s
Test on windows-latest with all features	14m 2s
Test on macOS-latest with all features	15m 38s
	1h 44m 40s

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