GfColorSpace::ConvertRGBSpan documentation is incorrect

[jerry-huxtable-foundry]

The description of GfColorSpace::ConvertRGBSpan says that it "Convert in place a packed array of RGBA values from one color space to "this one.". In fact, it converts in the opposite direction. The parameter named "srcColorspace" in the documentation is named "to" in the USD source code.

[jesschimein]

Filed as internal issue #USD-11674

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