add documentation for GENERAL_NAME_create() #1262

Job	Run time
run-checker (no-cmp)	4m 51s
run-checker (no-cms)	5m 18s
run-checker (no-dgram)	5m 26s
run-checker (no-dh)	5m 5s
run-checker (no-dtls)	5m 14s
run-checker (no-ec)	4m 22s
run-checker (no-ecx)	5m 27s
run-checker (no-http)	4m 56s
run-checker (no-legacy enable-unstable-qlog)	5m 14s
run-checker (no-sock)	4m 46s
run-checker (enable-ssl-trace)	5m 49s
run-checker (no-stdio)	2m 7s
run-checker (no-threads)	4m 57s
run-checker (no-thread-pool)	5m 13s
run-checker (no-default-thread-pool)	5m 11s
run-checker (no-tls)	4m 43s
run-checker (no-tls1_2)	5m 7s
run-checker (no-tls1_3)	4m 51s
run-checker (enable-trace enable-fips)	5m 38s
run-checker (no-ui)	5m 56s
run-checker (no-quic)	4m 58s
	1h 45m 9s

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