Docs improvements #2916

Job	Run time
Check Documentation	53s
Check no_std	29s
List directories for parallelizing tests	5s
Check (stable)	15s
Check Style	5s
Check (nightly)	1m 15s
Test (stable)	9m 4s
Test assembly	8m 32s
Test (nightly)	18m 4s
Test (cp6_782/)	5s
Test (mnt4_753/)	9m 16s
Test (mnt6_753/)	11s
Test (./ed25519)	1m 15s
Test (./mnt6_298)	5m 41s
Test (./grumpkin)	1m 11s
Test (./ed_on_cp6_782)	1m 19s
Test (./ed_on_mnt4_753)	3m 47s
Test (./ed_on_bw6_761)	44s
Test (./bls12_381)	3m 14s
Test (./ed_on_bls12_381_bandersnatch)	1m 2s
Test (./ed_on_mnt4_298)	1m 15s
Test (./secq256k1)	57s
Test (./bn254)	2m 18s
Test (./mnt4_298)	3m 57s
Test (./secp256r1)	1m 0s
Test (./vesta)	1m 35s
Test (./ed_on_bn254)	1m 3s
Test (./bw6_761)	4m 2s
Test (./curve25519)	1m 7s
Test (./pallas)	1m 8s
Test (./ed_on_bls12_377)	1m 8s
Test (./secp384r1)	1m 20s
Test (./secp256k1)	1m 3s
Test (./ed_on_bls12_381)	1m 15s
Test (./bls12_377)	4m 12s
Test (./bw6_767)	3m 55s
	1h 37m 42s

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