Improve sumcheck docs #372

Job	Run time
Check Spelling	12s
check-changed-files / Check Changed Files	9s
extract-cuda-backend-branch / Extract cuda branch name	7s
Check Code Format	35s
Run Rust Examples	53s
Test curve on Linux (bn254, -DG2=ON -DECNTT=ON)	30m 15s
Build and test Go & RUST hash on Linux	1m 18s
Test field on Linux (babybear, -DEXT_FIELD=ON)	7m 18s
Test curve on Linux (bls12_381, -DG2=ON -DECNTT=ON)	29m 42s
Test field on Linux (stark252, -DEXT_FIELD=OFF)	5m 58s
Test curve on Linux (bls12_377, -DG2=ON -DECNTT=ON)	12m 57s
Test field on Linux (m31, -DEXT_FIELD=ON)	2m 49s
Test curve on Linux (bw6_761, -DG2=ON -DECNTT=ON)	22m 13s
Test field on Linux (koalabear, -DEXT_FIELD=ON)	5m 56s
Test curve on Linux (grumpkin, -DG2=OFF -DECNTT=OFF)	3m 10s
	2h 3m 32s

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