Add some documentation in the policy module #130

Job	Run time
Minimal versions	25s
Test (beta, ubuntu-latest, beta)	26s
Check Documentation	21s
Test (win32, windows-latest, stable-i686-pc-windows-msvc)	1m 47s
Test (mingw, windows-latest, stable-x86_64-pc-windows-gnu)	1m 4s
Test (stable, ubuntu-latest, stable)	17s
Test (win64, windows-latest, stable-x86_64-pc-windows-msvc)	2m 2s
Test (macos, macos-latest, stable)	32s
Test (nightly, ubuntu-latest, nightly)	25s
Check Format and Clippy	18s
	7m 37s

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