Add missing function comment

MD_JAIL.php

@@ -233,6 +233,9 @@ public function __construct() {
 
     }
 
+    /**
+     * Destructor. Throws an exception if the settings have not been set.
+     */
     public function __destruct() {
 
         if ($this->_status !== self::STATUS_SPECIFIED) {
@@ -255,6 +258,5 @@ public function __destruct() {
         }
 
     }
-
 }
 

MD_STD_IN.php

@@ -9,7 +9,6 @@
  * functions.
  */
 final class MD_STD_IN {
-
     /**
      * Validates and sanitizes input integers to be in line with MySQL
      * autoincrement IDs.
@@ -231,5 +230,4 @@ public static function validate_isbn(string $input):string {
         throw new MDgenericInvalidInputsException("ISBNs must be either 10 or 13 characters long.");
 
     }
-
 }

exceptions/MDJailSecurityOptionNotSetException.php

@@ -5,7 +5,6 @@
  * Exception thrown by MDJail if a required security option has not been set.
  */
 final class MDJailSecurityOptionNotSetException extends Exception {
-
     /**
      * Error message.
      *
@@ -17,5 +16,4 @@ public function errorMessage() {
         return $errorMsg;
 
     }
-
 }