Tests

Remove format_code_in_doc_comments from rustfmt.toml #890

Job	Run time
Rustfmt	13s
clippy_check	20s
test (x86_64-unknown-linux-gnu)	1m 59s
test (armv7-unknown-linux-gnueabihf)	7m 23s
doc-build	19s
test-minimal (secp256kfun)	1m 27s
test-minimal (sigma_fun)	48s
test-nightly	1m 33s
build	26s
test-minimal (ecdsa_fun)	1m 13s
test-alloc (secp256kfun)	1m 22s
test-minimal (schnorr_fun)	1m 10s
test-alloc (sigma_fun)	1m 4s
test-alloc (ecdsa_fun)	1m 0s
test-alloc (schnorr_fun)	1m 20s
	21m 37s

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