Fix code block declaration

p · p · commit 55c29fc92d0f · 2019-05-23T15:01:58.000-04:00
diff --git a/docs/tutorials/ruby-driver-authentication.txt b/docs/tutorials/ruby-driver-authentication.txt
@@ -153,7 +153,7 @@ To use Kerberos authentication from Ruby,
 `mongo_kerberos <https://rubygems.org/gems/mongo_kerberos>`_ must be
 installed. Add to your ``Gemfile``:
 
-.. code-block:: plain
+.. code-block:: ruby
 
   gem 'mongo'
   gem 'mongo_kerberos'
