Add comments to Verilog Wishbone manager code #1856

Job	Run time
Check Formatting	8s
Clippy Lints	33s
Unit Tests (stable)	1m 24s
Unit Tests (beta)	1m 22s
Check Minimum Rust Version for protocols library	28s
Type-check, lint & format Python files	10s
Performance Benchmarks	4m 5s
Unit Tests (nightly)	1m 48s
	9m 58s

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