docs(pr-x12): canon follow-ups — R-7 path fix, R-13 primitives, R-14, R-15 #464

Job	Run time
hpc-stream-parallel/rayon	1m 30s
Pass MSRV values to other jobs	4s
format/stable	22s
native-backend/stable	7m 55s
nostd/thumbv6m-none-eabi/stable	24s
tier4-avx512-check	33s
clippy/1.95.0	44s
docs/nightly	-1s
nightly-simd-polyfill	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	-1s
cargo-careful	-1s
miri	-1s
blas-msrv	51s
tests/stable	11m 6s
tests/beta	10m 50s
tests/1.95.0	10m 39s
conclusion	0s
	44m 54s

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