docs: make Callout closable in the first Close Button example
docs: make Callout closable in the first Close Button example

People could get confused with the example showing a close button that have not effect. This commit makes the Callout closable in the first Close Button example.

abdullahsalem/foundation-sites,zurb/foundation-sites,zurb/foundation,DaSchTour/foundation-sites,denisahac/foundation-sites,zurb/foundation-sites,denisahac/foundation-sites,abdullahsalem/foundation-sites,zurb/foundation,DaSchTour/foundation-sites,denisahac/foundation-sites,zurb/foundation,abdullahsalem/foundation-sites,zurb/foundation-sites