The open source OpenXR runtime

doc: Document !666 and !667

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doc/changes/auxiliary/mr.666.md
··· 1 + u/distortion: Improve both Vive and Index distortion by fixing polynomial math.
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doc/changes/auxiliary/mr.667.md
··· 1 + u/distortion: Improve Index distortion and tidy code. While this touches the 2 + Vive distortion code all Vive headsets seems to have the center set to the same 3 + for each channel so doesn't help them. And Vive doesn't have the extra 4 + coefficient that the Index does so no help there either.