Minor tweaks to Repository section

Author: wouterj

book/doctrine.rst

@@ -772,10 +772,10 @@ Custom Repository Classes
 
 In the previous sections, you began constructing and using more complex queries
 from inside a controller. In order to isolate, test and reuse these queries,
-it's a good idea to create a custom repository class for your entity and
+it's a good practise to create a custom repository class for your entity and
 add methods with your query logic there.
 
-To do this, add the name of the repository class to your mapping definition.
+To do this, add the name of the repository class to your mapping definition:
 
 .. configuration-block::