Typos.

lib/SimpleSAML/Configuration.php

@@ -412,7 +412,7 @@ class SimpleSAML_Configuration
 
 
     /**
-     * Check whether an key in the configuration exists.
+     * Check whether a key in the configuration exists or not.
      *
      * @param string $name The key in the configuration to look for.
      *
@@ -797,7 +797,7 @@ class SimpleSAML_Configuration
      *                  isn't given, the option will be considered to be mandatory. The default value can be
      *                  any value, including null.
      *
-     * @return mixed The option with the given name, or $default if the option isn't found adn $default is given.
+     * @return mixed The option with the given name, or $default if the option isn't found and $default is given.
      *
      * @throws Exception If the option does not have any of the allowed values.
      */