[v0.10] docs: update man page for H.264 stuff #3349 #2281

Job	Run time
cppcheck	3m 51s
min features with gcc	2m 15s
code formatting check	16s
min features with g++	2m 18s
min features with clang	2m 28s
max features with gcc	3m 14s
max features with g++	2m 30s
max features with clang	3m 28s
max features with gcc and DEBUG	2m 50s
max features with gcc for 32-bit arch (legacy OS)	1m 31s
max features with g++ for 32-bit arch (legacy OS)	1m 25s
max features with clang for 32-bit arch (legacy OS)	1m 42s
	27m 48s

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