Try to fix doc rendering for old versions of docsite #1211

Job	Run time
test-docs	4m 55s
build-linux / run	4m 4s
build-windows / run	4m 25s
compiler-bridge / run	24s
lint-autofix / run	22s
linux (11, '{scalajslib,scalanativelib,kotlinlib}.__.testCached') / run	24s
linux (11, 'example.{depth,extending}.__.local.testCached') / run	36s
linux (11, 'integration.{failure,feature,ide}.__.local.testCached') / run	37s
linux (11, 'example.thirdparty[{mockito,acyclic,commons-io}].local.testCached') / run	37s
linux (17, '{main,scalalib,testrunner,bsp,testkit}.__.testCached') / run	22s
linux (17, 'example.javalib.__.local.testCached') / run	1s
linux (17, 'example.kotlinlib.__.local.testCached') / run	36s
linux (17, 'example.scalalib.__.local.testCached') / run	1s
linux (17, 'example.thirdparty[{fansi,jimfs,netty,gatling}].local.testCached') / run	1s
itest (11, ci/test-mill-dev.sh && ci/test-mill-release.sh && ./mill -i -k __.ivyDepsTree && ./mil... / run	1s
itest (17, ci/test-mill-bootstrap.sh) / run	1s
linux (17, 'integration.invalidation.__.server.testCached') / run	1s
linux (17, 'integration.invalidation.__.fork.testCached') / run	1s
linux (17, contrib.__.testCached) / run	1s
windows	1s
	17m 31s

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