add throw_if_error test, standardize docs comments #214

Job	Run time
lib_android (monero)	27m 26s
lib_android (wownero)	30m 12s
lib_darwin (monero)	14m 1s
ios build (monero)	11m 17s
lib_darwin (wownero)	13m 41s
ios build (wownero)	11m 8s
lib_linux (monero)	30m 34s
lib_linux (wownero)	30m 40s
macos build (monero)	3m 14s
lib_mingw (monero)	3m 9s
lib_sailfishos_aarch64 (monero)	3m 12s
macos build (wownero)	4m 16s
lib_mingw (wownero)	3m 8s
lib_sailfishos_aarch64 (wownero)	3m 20s
lib_sailfishos_i486 (monero)	2m 7s
lib_sailfishos_i486 (wownero)	1m 52s
test ts library	1m 2s
regression_check (monero)	2m 43s
regression_check (wownero)	2m 2s
create single release file	0s
comment on pr	0s
	3h 19m 4s

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