docs(bitfield): replace tables with bulleted lists #1240

Job	Run time
changed_paths	4s
clippy	5m 53s
cargo check (host)	7m 8s
cargo test (host)	12m 4s
rustfmt	28s
Loom tests (cordyceps)	2m 27s
Miri tests (codyceps)	3m 53s
build boot image (x86_64)	9m 9s
docs	9m 0s
Tests (maitake, no-default-features)	5m 47s
cargo test (cross x64)	7m 35s
Loom tests (maitake)	4m 7s
Loom tests (mycelium-util)	2m 14s
	1h 9m 49s

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