google-fonts: Fix typos in homepage, description

In the `meta`data for the `google-fonts` package --

  - the `homepage` field was set to the URL
    <https://www.google.com/fontsl>, which would appear to be a
    misspelt version of <https://www.google.com/fonts>, which now
    redirects to <https://fonts.google.com>.

  - the `description` field referred to Google Fonts as "Google Font".

This patch corrects these errors, and updates the `homepage` URL.