add documentation for GENERAL_NAME_create() #2021

Job	Run time
basic_clang	5m 9s
basic_gcc	5m 12s
check_docs	47s
check_update	1m 18s
minimal	2m 21s
self-hosted (freebsd-13.2)	1s
self-hosted (ubuntu-arm64-22.04)	1s
address_ub_sanitizer	10m 8s
check-ansi	2m 22s
enable_non-default_options	4m 11s
external-test-cf-quiche	3m 42s
external-test-pyca (1.51.0, 3.9)	8m 43s
external-tests	10m 30s
full_featured	5m 28s
fuzz_tests	2m 59s
legacy	3m 56s
memory_sanitizer	19m 7s
no-deprecated	4m 58s
no-legacy	5m 2s
non-caching	15m 32s
no-shared-macos	6m 2s
no-shared-ubuntu	3m 48s
out-of-readonly-source-and-install-macos	10m 50s
out-of-readonly-source-and-install-ubuntu	6m 54s
threads_sanitizer	5m 37s
	2h 24m 38s

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