Grid Design Pattern: Simplify Language

Per feedback from @a11ydoer in issue #227,
Modified the grid design pattern in aria-practices.html.
Reworded to eliminate use of the word 'nomenclature' and to clarify meaning.

aria-practices.html

@@ -1252,7 +1252,7 @@ <h3>Grids : Interactive Tabular Data and Layout Containers</h3>
         A <a href="#grid" class="role-reference">grid</a> widget is a container that enables users to navigate the information or interactive elements it contains using directional navigation keys, such as arrow keys, <kbd>Home</kbd> , and <kbd>End</kbd>.
         As a generic container widget that offers flexible keyboard navigation, it can serve a wide variety of needs.
         It can be used for purposes as simple as grouping a collection of checkboxes or navigation links or as complex as creating a full-featured spreadsheet application.
-        While ARIA properties and assistive technologies use row and column nomenclature when describing and presenting the logical structure of elements with the <code>grid</code> role, using the <code>grid</code> role on an element does not necessarily imply that its visual presentation is tabular.
+        While the words &quot;row&quot; and &quot;column&quot; are used in the names of WAI-ARIA attributes and by assistive technologies when describing and presenting the logical structure of elements with the <code>grid</code> role, using the <code>grid</code> role on an element does not necessarily imply that its visual presentation is tabular.
       </p>
 
       <p>When presenting content that is tabular, consider the following factors when choosing between implementing this <code>grid</code> pattern or the <a href="#table">table</a> pattern.</p>