Tests

[musig] new_with_synthetic_nonces had the wrong docs #710

Job	Run time
clippy_check	28s
build	27s
doc-build	16s
Rustfmt	14s
test (x86_64-unknown-linux-gnu)	58s
test-alloc (secp256kfun)	58s
test (armv7-unknown-linux-gnueabihf)	5m 46s
test-minimal (secp256kfun)	58s
test-alloc (sigma_fun)	15s
test-nightly	50s
test-minimal (sigma_fun)	15s
test-alloc (ecdsa_fun)	40s
test-minimal (ecdsa_fun)	40s
test-alloc (schnorr_fun)	49s
test-minimal (schnorr_fun)	46s
	14m 20s

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