Fixing markup and comment

Fixing markup and comment

Minor fixes in yourls-infos.php:
1. Removes an unclosed and superfluous <strong> tag in the line reading e.g.  '43 hits on January 1, 1970'. This caused wrong HTML and therefore most browsers rendered *all* dates in the list appearing on click of 'Click for more details' with bold font-weight (i.e., not only those of the best year / month / day as intended).
2. Took the liberty of also changing a closing comment token from '/**/' to the more common '**/' (in the comment titled 'I can haz debug data'). While this was perfectly valid code, it confused the syntax highlighter of github (all past the '/**/' appeared in a frightening red).