crl: avoid markdown footnotes #497

Job	Run time
Build rustls-cert-gen as a standalone package	26s
build (macOS-latest, stable)	29s
build-windows	9m 45s
Validate external types appearing in public API	1m 30s
build (ubuntu-latest, stable)	40s
Measure coverage	5m 35s
build (ubuntu-latest, beta)	5m 54s
Format & clippy	5m 12s
build (ubuntu-latest, nightly)	5m 46s
Documentation (stable)	56s
build (ubuntu-latest, stable 7 months ago)	52s
Check semver compatibility	48s
Documentation (nightly)	1m 2s
	38m 55s

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