Clarify CRLF mode effect #2136

Job	Run time
msrv	3m 14s
test (stable, ubuntu-latest, stable)	3m 53s
test (stable-32, ubuntu-latest, stable, i686-unknown-linux-gnu)	2m 42s
miri-regex-automata	7m 14s
rustfmt	9s
testfull-regex	3m 26s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	7m 26s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	9m 2s
testfull-regex-automata	8m 24s
testfull-regex-capi	26s
test (beta, ubuntu-latest, beta)	3m 46s
testfull-regex-syntax	2m 13s
test (nightly, ubuntu-latest, nightly)	4m 10s
test (macos, macos-latest, stable)	4m 49s
test (win-msvc, windows-latest, stable)	6m 22s
test (win-gnu, windows-latest, stable-x86_64-gnu)	3m 49s
	1h 11m 5s

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