Update DeepNSM documentation and add imports for semantic primes #23

Job	Run time
native-backend/stable	28s
Pass MSRV values to other jobs	2s
format/stable	16s
nostd/thumbv6m-none-eabi/stable	17s
clippy/stable	30s
cross_test/i686-unknown-linux-gnu/stable	1m 18s
cross_test/s390x-unknown-linux-gnu/stable	1m 21s
miri	0s
docs/nightly	0s
cargo-careful	0s
tests/beta	1m 27s
tests/1.64.0	1m 27s
blas-msrv	31s
tests/stable	1m 13s
conclusion	0s
	8m 50s

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