Understanding Xcode Documentation Reference Library

I'm trying to understand the API documentation that comes with Xcode (Help->Documentation).
I'd like to look at OpenGL ES API documentation. So, I downloaded "Developer Tools Library" under the "Apple Xcode 3.1" Doc Set. When browsing, it's not clear where to locate the API doc information. Instead, I closed the browse mode and search for an OpenGL function: glMatrixMode. The function shows up in the top documentation window (with the following headings: Symbol Name, Class, Language, Type, Documentation Set). Click on the function name, however, does not give me additional information on that function. What's the point of having just the function name in the documentation if it's not documented?
Is there something else I need to download to get full OpenGl ES documentation?

I think the Developer Documentation just documents Apple's extensions and interfaces. You can get documentation for OpenGL itself from the source: http://www.opengl.org/sdk/docs/

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