br3 → br4 in docs

The border radius 4 element currently appears as ”br3” instead of “br4” in the “Border Radii” docs.

Author: nickcernis

index.html

@@ -967,7 +967,7 @@ <h3 class="f6 ttu fw6 mt0 mb3 bb pb2">Border Radii</h3>
           <div class="ba dib ph4 pv3 mb4  br1">br1</div>
           <div class="ba dib ph4 pv3 mb4  br2">br2</div>
           <div class="ba dib ph4 pv3 mb4  br3">br3</div>
-          <div class="ba dib ph4 pv3 mb4  br4">br3</div><br>
+          <div class="ba dib ph4 pv3 mb4  br4">br4</div><br>
 <div class="dt dt--fixed">
           <div class="dtc v-mid"><div class="ba dib mb4 br-100 h3 w3 pa4 tc"></div></div>
           <div class="dtc v-mid"><div class="ba dib mb4 ph4 pv3  br-pill">pill</div></div>