Minor nit fix to EVP_CipherFinal_ex() return code documentation. #415

Job	Run time
check_docs	58s
check_update	1m 19s
address_ub_sanitizer	10m 57s
basic_clang	5m 57s
basic_gcc	5m 53s
check-ansi	2m 35s
enable_non-default_options	4m 48s
full_featured	6m 16s
fuzz_tests	3m 9s
legacy	4m 48s
minimal	2m 38s
memory_sanitizer	18m 9s
no-deprecated	5m 19s
no-legacy	5m 48s
non-caching	12m 43s
no-shared-macos (macos-13)	9m 45s
no-shared-ubuntu	4m 40s
self-hosted	0s
threads_sanitizer	5m 46s
no-shared-macos (macos-14)	5m 34s
external-tests-providers	9m 4s
external-tests-pyca (1.51.0, 3.9)	7m 6s
external-tests-misc	8m 5s
out-of-readonly-source-and-install-macos (macos-13)	13m 12s
out-of-readonly-source-and-install-ubuntu	7m 59s
out-of-readonly-source-and-install-macos (macos-14)	6m 31s
	2h 48m 59s

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