Document current default permissions for tempdirs (#296) #252

Job	Run time
WASM Test Build	13s
WASI Test Build	20s
OS Test (nightly, ubuntu-latest)	17s
Cargo deny (ubuntu-latest)	20s
OS Test (nightly, windows-latest)	36s
Clippy and fmt	13s
OS Test (nightly, macos-latest)	18s
OS Test (stable, ubuntu-latest)	16s
OS Test (stable, windows-latest)	50s
OS Test (stable, macos-latest)	18s
OS Test (1.63, ubuntu-latest)	2m 17s
OS Test (1.63, windows-latest)	2m 47s
OS Test (1.63, macos-latest)	2m 9s
	10m 54s

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