FF104 adds support for CanvasRenderingContext2D.fontKerning (#17524)
FF104 adds support for CanvasRenderingContext2D.fontKerning (#17524)

* FF104 adds support for CanvasRenderingContext2D.fontKerning

* Add link to mdn topic

* Add MDN urls for the new pages

* fontKerning no longer experimtal if both FF and Chrome support it
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data