Refactor parseDate function signature in AbstractSearch

Removed unnecessary comments and added type hinting to the function parseDate in the AbstractSearch class. Any string passed to this function will now explicitly be expected as a string data type, increasing code robustness and easing debugging process.

src/Bundle/ChillMainBundle/Search/AbstractSearch.php

@@ -24,13 +24,11 @@ abstract class AbstractSearch implements SearchInterface
     /**
      * parse string expected to be a date and transform to a DateTime object.
      *
-     * @param type $string
-     *
      * @return \DateTime
      *
      * @throws ParsingException if the  date is not parseable
      */
-    public function parseDate($string)
+    public function parseDate(string $string)
     {
         try {
             return new \DateTime($string);