Document side-by-side changes #3268

Job	Run time
Output Regression Test	3m 58s
Check Linux Packaging	3m 34s
Rustfmt	1m 13s
Test x86_64-unknown-linux-gnu	2m 46s
Test Linux (latest stable Rust)	2m 11s
Test x86_64-apple-darwin	4m 30s
Test with MIME database	3m 32s
Actionlint	1m 17s
Test x86_64-pc-windows-msvc	3m 42s
Test aarch64-unknown-linux-gnu	5m 28s
Test aarch64-apple-darwin	3m 19s
Test x86_64-unknown-linux-musl	3m 4s
	38m 34s

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