Tweaks. refs #11439

Author: OskarStark

serializer/custom_encoders.rst

@@ -50,8 +50,10 @@ create your own encoder that uses the
 
 .. tip::
 
-    If you need access to ``$context`` in your ``supportsDecoding`` or ``supportsEncoding`` method, make sure
-    to implements ``Symfony\Component\Serializer\Encoder\ContextAwareEncoderInterface`` or ``Symfony\Component\Serializer\Encoder\ContextAwareEncoderInterface`` interface
+    If you need access to ``$context`` in your ``supportsDecoding`` or
+    ``supportsEncoding`` method, make sure to implement
+    ``Symfony\Component\Serializer\Encoder\ContextAwareDecoderInterface``
+    or ``Symfony\Component\Serializer\Encoder\ContextAwareEncoderInterface`` accordingly.
 
 
 Registering it in your app