Fix code smells

src/MD_STD.php

@@ -445,7 +445,7 @@ final class MD_STD {
      *
      * @param string $url URL to validate.
      *
-     * @return bool
+     * @return boolean
      */
     public static function checkUrlIsReachable(string $url):bool {
 
@@ -952,7 +952,7 @@ final class MD_STD {
      * 0000-01-01 > 101; 2001-01-01 > 20010101.
      * Needed to retrieve negative dates (BC) stored in MySQL.
      *
-     * @param int $date_int Date represented as an integer.
+     * @param integer $date_int Date represented as an integer.
      *
      * @return string
      */
@@ -979,6 +979,5 @@ final class MD_STD {
             false => '',
         } . $year . '-' . $month . '-' . $day;
 
-
     }
 }