Remove the unused workspace attribute `rustdocflags` (#702) #2571

Job	Run time
Check Documentation	58s
Check (stable)	7s
Check Style	10s
Check (nightly)	1m 9s
Test (stable)	5m 28s
Test (nightly)	10m 58s
Check no_std	31s
List directories for parallelizing tests	5s
Test assembly	5m 20s
Test against curves (bls12_377)	3m 37s
Test (cp6_782/)	12s
Test (mnt4_753/)	14s
Test against curves (bls12_381)	2m 57s
Test (mnt6_753/)	15s
Test against curves (bn254)	1m 44s
Test against curves (pallas)	2m 5s
Test against curves (bw6_761)	2m 49s
Test against curves (mnt4_298)	2m 11s
Test against curves (mnt6_298)	3m 0s
Test against curves (ed_on_bls12_377)	1m 10s
Test (./bw6_761)	2m 56s
Test (./ed_on_mnt4_298)	59s
Test (./ed_on_mnt4_753)	1m 44s
Test (./pallas)	1m 0s
Test (./bn254)	1m 58s
Test (./ed_on_cp6_782)	54s
Test (./ed25519)	52s
Test (./secq256k1)	1m 32s
Test (./ed_on_bls12_381)	1m 21s
Test (./secp256k1)	1m 4s
Test (./grumpkin)	1m 0s
Test (./bls12_377)	3m 24s
Test (./ed_on_bw6_761)	41s
Test (./curve25519)	1m 0s
Test (./mnt4_298)	2m 11s
Test (./bls12_381)	2m 49s
Test (./secp384r1)	1m 5s
Test (./mnt6_298)	2m 51s
Test (./bw6_767)	3m 4s
Test (./secp256r1)	46s
Test (./ed_on_bls12_377)	1m 0s
Test (./ed_on_bls12_381_bandersnatch)	57s
Test (./ed_on_bn254)	59s
Test (./vesta)	1m 2s
	1h 22m 9s

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