crl: avoid markdown footnotes #494

Job	Run time
Build rustls-cert-gen as a standalone package	27s
Validate external types appearing in public API	1m 32s
build (macOS-latest, stable)	3m 51s
build-windows	11m 51s
build (ubuntu-latest, stable)	5m 59s
Measure coverage	5m 53s
build (ubuntu-latest, beta)	6m 5s
Format & clippy	5m 9s
build (ubuntu-latest, nightly)	6m 7s
Documentation (stable)	59s
build (ubuntu-latest, stable 7 months ago)	6m 19s
Documentation (nightly)	1m 0s
Check semver compatibility	3m 7s
	58m 19s

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