Update mstyle compatibility data (#17043)
Update mstyle compatibility data (#17043)

* Update mstyle compatibility data

* Update data for Chrome, based on info from mathml.global_attribute.

* Update notes for Firefox, taken from Gecko-specific notes of
  https://developer.mozilla.org/en-US/docs/Web/MathML/Element/mstyle

* Remove dir, displaystyle, scriptlevel since they now belong to
  mathml.global_attribute

* Update scriptminsize/scriptsizemultiplier, removed in Firefox 103
  and not part of MathML Core.

* Move chromium & firefox's partial implementations into a separate object.
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data