Add to the 'thanks' list, and fix formatting.

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Spec how texImage2D sets the texture width and height depending on the element

It is worthwhile to spec this explicitly to avoid any ambiguity,
especially for less straightforward cases like SVG images.
Merge pull request #511 from jdashg/more-credit

Add to the 'thanks' list, and fix formatting.
Merge pull request #512 from NVIDIA/teximage2d-width-height-spec

Spec how texImage2D sets the texture width and height depending on the element