Fix type on measure

Author: mrmrs

docs/typography/measure/index.html

@@ -57,7 +57,7 @@
         <h4 class="f4 mv0 fw6 dib mr4">tachyons-typography</h4>
         <span class="f4 b dib pl0 ml0 mr4">v3.0.1</span>
         <span class="f4 b dib pl0 ml0 mr4">270 B</span>
-        <p class="measure f4 f3-ns lh-copy">
+        <p class="measure f4 lh-copy">
           Measure refers to the length of a line of text. It is one of the most important aspects
           of readability.
         </p>