Remove reference to sizeclasses.com

[igorsantos07]

Platforms affected

iOS

Motivation and Context

That website is now parked, probably got abandoned.

Description

Just removed a line referring to the defunct website.

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[igorsantos07]

BTW, that checklist seems generic, since this docs repository obviously has no tests haha

[dpogue]

Thanks for finding and fixing this! 🙇🏼

I see you've updated it for the current version of the docs (12.x), could you also remove it from the dev version of the docs? That way it won't re-appear when we publish a v13. The dev version file should be https://github.com/apache/cordova-docs/blob/master/www/docs/en/dev/core/features/splashscreen/index.md

[igorsantos07]

Whoops! Didn't realize that. Done!