cogl/texture-2d: Remove notes about COGL_FEATURE_ID_TEXTURE_NPOT
NPOT capabilities were made madatory in OpenGL 2.0 and GLES 2.0, so let's stop encouraging developers to write new code with checks for it.
Follow-up of 803ffc19
NPOT capabilities were made madatory in OpenGL 2.0 and GLES 2.0, so let's stop encouraging developers to write new code with checks for it.
Follow-up of 803ffc19