Robert Bragg fca054e949 cogl docs: Improve documentation for cogl_ortho ...

cogl_ortho is one of those APIs whos style was, for better or worse,
copied from OpenGL and for some inexplicable reason the near and far
arguments are inconsistent with the left, right, top, bottom arguments
because they don't take z coordinates they take a "distance" which
should be negative for a plane behind the viewer.

This updates the documentation to explain this.

2010-06-15 15:26:28 +01:00

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