Concatenate dense MLEs & update documentation #2893

Job	Run time
Check Style	14s
Check Documentation	1m 8s
Check no_std	24s
Check (stable)	11s
List directories for parallelizing tests	3s
Check (nightly)	1m 7s
Test (stable)	9m 15s
Test assembly	8m 35s
Test (nightly)	18m 2s
Test (cp6_782/)	12s
Test (mnt4_753/)	14s
Test (mnt6_753/)	12s
Test (./ed25519)	55s
Test (./mnt6_298)	5m 32s
Test (./grumpkin)	1m 34s
Test (./ed_on_cp6_782)	1m 37s
Test (./ed_on_mnt4_753)	3m 56s
Test (./ed_on_bw6_761)	43s
Test (./bls12_381)	3m 22s
Test (./ed_on_bls12_381_bandersnatch)	1m 13s
Test (./ed_on_mnt4_298)	1m 4s
Test (./secq256k1)	1m 1s
Test (./bn254)	2m 29s
Test (./mnt4_298)	3m 59s
Test (./secp256r1)	52s
Test (./vesta)	1m 10s
Test (./ed_on_bn254)	1m 0s
Test (./bw6_761)	3m 59s
Test (./curve25519)	1m 12s
Test (./pallas)	1m 8s
Test (./ed_on_bls12_377)	1m 5s
Test (./secp384r1)	1m 25s
Test (./secp256k1)	1m 13s
Test (./ed_on_bls12_381)	1m 27s
Test (./bls12_377)	4m 17s
Test (./bw6_767)	4m 11s
	1h 30m 1s

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