Improve grammar in docblocks: "a admin" → "an admin" (#1322)

lib/SimpleSAML/Utils/Auth.php

@@ -17,7 +17,7 @@ use SimpleSAML\Session;
 class Auth
 {
     /**
-     * Retrieve a admin login URL.
+     * Retrieve an admin login URL.
      *
      * @param string|NULL $returnTo The URL the user should arrive on after admin authentication. Defaults to null.
      *
@@ -35,7 +35,7 @@ class Auth
 
 
     /**
-     * Retrieve a admin logout URL.
+     * Retrieve an admin logout URL.
      *
      * @param string|NULL $returnTo The URL the user should arrive on after admin authentication. Defaults to null.
      *

modules/core/www/login-admin.php

 <?php
 
 /*
- * Helper page for starting a admin login. Can be used as a target for links.
+ * Helper page for starting an admin login. Can be used as a target for links.
  */
 
 if (!array_key_exists('ReturnTo', $_REQUEST)) {