add documentation for GENERAL_NAME_create() #1073

Job	Run time
compiler (gcc-7, ubuntu-20.04)	4m 21s
compiler (gcc-8, ubuntu-20.04)	4m 1s
compiler (gcc-9, ubuntu-20.04)	4m 8s
compiler (gcc-10, ubuntu-20.04)	4m 2s
compiler (gcc-11, ubuntu-22.04)	4m 34s
compiler (gcc-12, ubuntu-22.04)	4m 40s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	1m 49s
compiler (clang-6.0, ubuntu-20.04)	4m 37s
compiler (clang-7, ubuntu-20.04)	4m 34s
compiler (clang-8, ubuntu-20.04)	4m 15s
compiler (clang-9, ubuntu-20.04)	4m 27s
compiler (clang-10, ubuntu-20.04)	4m 19s
compiler (clang-11, ubuntu-20.04)	4m 18s
compiler (clang-12, ubuntu-20.04)	4m 25s
compiler (clang-13, ubuntu-22.04)	4m 42s
compiler (clang-14, ubuntu-22.04)	4m 43s
compiler (clang-15, ubuntu-22.04, jammy)	4m 43s
compiler (clang-16, ubuntu-22.04, jammy)	4m 58s
compiler (clang-17, ubuntu-22.04, jammy)	4m 57s
	1h 22m 33s

Provide feedback