lite: fix doctests on 32-bit #1938

Job	Run time
rustfmt	23s
miri-regex-automata	10m 49s
msrv	5m 5s
test (stable, ubuntu-latest, stable)	9m 37s
test (stable-32, ubuntu-latest, stable, i686-unknown-linux-gnu)	4m 40s
testfull-regex	7m 21s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	11m 28s
testfull-regex-capi	47s
testfull-regex-automata	19m 57s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	14m 6s
testfull-regex-syntax	3m 21s
test (beta, ubuntu-latest, beta)	8m 27s
test (nightly, ubuntu-latest, nightly)	7m 11s
test (macos, macos-latest, stable)	9m 9s
test (win-msvc, windows-latest, stable)	8m 27s
test (win-gnu, windows-latest, stable-x86_64-gnu)	5m 55s
	2h 6m 43s

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