fix(doctests): fix 3 doctest failures breaking CI #257

Job	Run time
Pass MSRV values to other jobs	4s
native-backend/stable	8m 0s
nostd/thumbv6m-none-eabi/stable	33s
clippy/1.94.1	42s
format/nightly	30s
cross_test/s390x-unknown-linux-gnu/stable	1m 47s
cross_test/i686-unknown-linux-gnu/stable	1m 41s
cargo-careful	0s
docs/nightly	0s
miri	0s
blas-msrv	1m 14s
tests/stable	11m 39s
tests/1.94.0	10m 53s
tests/beta	11m 18s
conclusion	0s
	48m 21s

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