Subgrid example only works in FF

[runofthemill]

Not sure how to word it best, but the codepen for the subgrid example only matches the screenshot (at the moment) when using Firefox.

Changes proposed in this pull request:

• Clarifies that the codepen link for the subgrid example will only render as expected in Firefox

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[chrome-devrel-review-bot]

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[malchata]

At current, subgrid is only supported in Firefox stable, Safari 16 (and Technical Preview). I imagine this is why it only works in Firefox for the moment. Source: httpsS://caniuse.com/?search=subgrid

As time goes on, and other browsers land subgrid, this should change. Perhaps a link to call out browser support would be best until subgrid reaches broader adoption across browsers.

[rachelandrew]

Subgrid is now interoperable.