Minor tweak

Author: javiereguiluz

contributing/documentation/format.rst

@@ -124,11 +124,11 @@ Markup Format        Use It to Display
 ``php-standalone``   PHP code to be used in any PHP application using standalone Symfony components
 ===================  ==============================================================================
 
-Display Tabs
-~~~~~~~~~~~~
+Displaying Tabs
+~~~~~~~~~~~~~~~
 
-It is possible to display tabs in the documentation. Even though their display
-looks like configuration blocks, tabs can contain any type of content:
+It is possible to display tabs in the documentation. They look similar to
+configuration blocks when rendered, but tabs can hold any type of content:
 
 .. code-block:: rst