clarify what the table of properties represents

Author: caseywatts

src/templates/table_of_properties.html

@@ -28,7 +28,7 @@
     <div class="ph3 ph5-ns">
         <h3 class="ttu tracked f4">Table of Properties</h3>
         <p class="measure lh-copy f5">
-          Here is a list of each property in Tachyons.
+          Here is a list of each css property that can be modified by a Tachyons class.
         </p>
       </div>
       </header>