ALLI-21969: polish docs markup

Author: aguashui

docs/consumers.rst

@@ -35,8 +35,8 @@ which your :doc:`producer <producers>` puts messages.
             with the underlying driver. Generally this happens if the persistent
             backend goes down or is unreachable. Without the driver, the consumer
             can't do its work.
-        :returns: True or false to indicate whether the message was handled successfully.
-            Null if no message was handled.
+        :returns: ``true`` or ``false`` to indicate whether the message was handled successfully.
+            ``null`` if no message was handled.
         :rtype: boolean or null
 
     .. php:method:: stop(int $code)

docs/handlers.rst

@@ -132,7 +132,7 @@ Use the same command bus with each message.
     $consumer = new DefaultConsumer($driver, $handler);
 
 Alternatively, you can create a new command bus to handle each message with
-`CreatingTacticianHandler`. This is useful if you're using
+``CreatingTacticianHandler``. This is useful if you're using
 :ref:`forking child processes <forking_handler>` to handle messages.
 
 .. code-block:: php