Improve documentation on filters #553

Job	Run time
feature_check	1m 1s
powerpc_cross	16s
feature_check (benchmarks)	57s
build (1.57.0, ubuntu-latest)	58s
build (1.57.0, windows-latest)	1m 36s
rustfmt	4s
build (1.57.0, macos-latest)	1m 18s
test_all	3m 1s
build (stable, ubuntu-latest)	11s
build (stable, windows-latest)	1m 12s
build (stable, macos-latest)	13s
build (beta, ubuntu-latest)	16s
build (beta, windows-latest)	39s
build (beta, macos-latest)	17s
build (nightly, ubuntu-latest)	20s
build (nightly, windows-latest)	37s
build (nightly, macos-latest)	19s
	13m 15s

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