Improvements for HTML5/XHTML specifications.

[DeeCorrector]

Introduction: In accordance with the w3 HTML5 specification for HTML code, void tags (see reference) should be marked as self-closing. During a scan for repositories containing HTML files, we found HTML code in your repository that needed this improvement.

Even though the self-closing specification is not a strict requirement by web-browsers, and they will happily parse the tags anyhow - that is not an excuse for not writing specification valid code. And given the spirit of open-source community, I will be more than happy to push these improvements to you. The changes in this Pull-Request will not break your HTML code, and the only changes that have been made is closing of void elements.

References: https://www.w3.org/TR/html5/syntax.html#void-elements