fix typos

src/Symfony/Component/Config/Definition/Builder/NumericNodeDefinition.php

@@ -12,7 +12,7 @@
 namespace Symfony\Component\Config\Definition\Builder;
 
 /**
- * Abstract class that contain common code of integer and float node definition.
+ * Abstract class that contains common code of integer and float node definitions.
  *
  * @author David Jeanmonod <david.jeanmonod@gmail.com>
  */

src/Symfony/Component/HttpKernel/EventListener/SessionListener.php

@@ -48,7 +48,7 @@ abstract class SessionListener implements EventSubscriberInterface
     /**
      * Gets the session object.
      *
-     * @return SessionInterface|null A SessionInterface instance of null if no session is available
+     * @return SessionInterface|null A SessionInterface instance or null if no session is available
      */
     abstract protected function getSession();
 }

src/Symfony/Component/HttpKernel/EventListener/TestSessionListener.php

@@ -78,7 +78,7 @@ abstract class TestSessionListener implements EventSubscriberInterface
     /**
      * Gets the session object.
      *
-     * @return SessionInterface|null A SessionInterface instance of null if no session is available
+     * @return SessionInterface|null A SessionInterface instance or null if no session is available
      */
     abstract protected function getSession();
 }