modules/prefill docs: fix dependencies

LFS isn't used since !912 (6d209ef9).
26 jobs for nitpicks in 5 minutes and 19 seconds (queued for 5 seconds)
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  Test
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build:darwin

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deckard

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doc

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dind
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lint:other

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lint:pedantic

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lint:tidy

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respdiff:basic

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test:valgrind

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amd64 linux docker delayed
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  Extended
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fwd-tls6-kresd.udp6
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fwd-udp6-kresd.udp6
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fwd-udp6-unbound.tcp6
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fwd-udp6-unbound.tls6
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fwd-udp6-unbound.udp6
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iter.tls6
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iter.udp6
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pytests
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resperf:fwd-tls6.udp-asan
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resperf:fwd-udp6.udp-asan
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resperf:iter.udp-asan