removed some errors in the code

Author: Raza403

classes/certificate.php

@@ -556,7 +556,7 @@ public static function issue_certificate($certificateid, $userid) {
      * Generates an unused code of random letters and numbers.
      *
      * @return string
-    */
+     */
     public static function generate_code(): string {
         global $DB;
 
@@ -572,7 +572,6 @@ public static function generate_code(): string {
         return self::generate_code_digits_with_hyphens();
     }
 
-    // Upper/lower/digits random string.
     /**
      * Generate a random code of the format XXXXXXXXXX, where each X is a character from the set [A-Za-z0-9].
      * Does not check that it is unused.

element/qrcode/classes/element.php

@@ -158,8 +158,7 @@ public function render($pdf, $preview, $user) {
             $context = \context::instance_by_id($issue->contextid);
 
             $urlparams = [
-                'code' => $code,
-                'qrcode' => 1,
+                'certId' => $code,
             ];
 
             // We only add the 'contextid' to the link if the site setting for verifying all certificates is off,