Clarify documentation on InvSize and Offsets uniforms set during quad rendering.

Docs/Reference.dox

@@ -1414,7 +1414,7 @@ Otherwise fully customized scene render passes can be specified, but there are a
 
 \section RenderPaths_PostProcess Post-processing effects special considerations
 
-Post-processing effects are usually implemented by using the quad command. When using intermediate rendertargets that are of different size than the viewport rendertarget, it is necessary in shaders to reference their (inverse) size and the half-pixel offset for Direct3D9. These shader uniforms are automatically generated for named rendertargets. For an example look at the bloom postprocess shaders: the rendertarget called HBlur will define the shader uniforms cHBlurInvSize and cHBlurOffsets (both Vector2.)
+Post-processing effects are usually implemented by using the quad command. When using intermediate rendertargets that are of different size than the viewport rendertarget, it is often necessary in shaders to reference their (inverse) size and the half-pixel offset for Direct3D9. These shader uniforms are automatically attempted to be assigned for named rendertargets. For an example look at the bloom postprocess shaders: because there is a rendertarget called BlurH, each quad command in the renderpath will attempt to set the shader uniforms cBlurHInvSize and cBlurHOffsets (both Vector2.) Note that setting shader uniforms is case insensitive.
 
 In OpenGL post-processing shaders it is important to distinguish between sampling a rendertarget texture and a regular texture resource, because intermediate rendertargets (such as the G-buffer) may be vertically inverted. Use the GetScreenPos() or GetQuadTexCoord() functions to get rendertarget UV coordinates from the clip coordinates; this takes flipping into account automatically. For sampling a regular texture, use GetQuadTexCoordNoFlip() function, which requires world coordinates instead of clip coordinates.