docs(pr-x12): canon follow-ups — R-7 path fix, R-13 primitives, R-14, R-15 #465

Job	Run time
tier4-avx512-check	29s
native-backend/stable	7m 52s
clippy/1.95.0	39s
hpc-stream-parallel/rayon	1m 23s
format/stable	22s
nostd/thumbv6m-none-eabi/stable	27s
Pass MSRV values to other jobs	3s
nightly-simd-polyfill	0s
docs/nightly	0s
miri	0s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
cargo-careful	0s
blas-msrv	52s
tests/beta	10m 44s
tests/1.95.0	10m 43s
tests/stable	10m 49s
conclusion	0s
	44m 23s

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