CLN: Fix typo in contributing.rst (#28761)

dsaxton · jschendel · commit ef936f963ce3 · 2019-10-02T17:55:31.000-06:00
diff --git a/doc/source/development/contributing.rst b/doc/source/development/contributing.rst
@@ -952,7 +952,7 @@ the expected correct result::
 Transitioning to ``pytest``
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-*pandas* existing test structure is *mostly* classed based, meaning that you will typically find tests wrapped in a class.
+*pandas* existing test structure is *mostly* class-based, meaning that you will typically find tests wrapped in a class.
 
 .. code-block:: python
 
