Updated documentation for OpenGL backend interfaces #3335

Job	Run time
Linux -> Pre-checks	16s
Linux -> GCC-x64, Debug	11m 39s
Linux -> GCC-x64, Release	11m 0s
Linux -> Clang-x64, Debug	12m 33s
Linux -> Clang-x64, Release	12m 37s
Linux -> Clang-NO_GLSLANG-x64, Debug	7m 35s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 9s
	1h 1m 49s

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