Consistent string name for comparison (#4512)

When reading each of the measurement marks, it helps to
have some continuity in the language so it's easy to recognize
what is different.

Author: mehulkar

files/en-us/web/api/performance/measure/index.html

@@ -87,7 +87,7 @@ <h2 id="Example">Example</h2>
     performance.measure("measure a to b", markerNameA, markerNameB);
     performance.measure("measure a to now", markerNameA);
     performance.measure("measure from navigation start to b", undefined, markerNameB);
-    performance.measure("measure from the start of navigation to now");
+    performance.measure("measure from navigation start to now");
 
     // Pull out all of the measurements.
     console.log(performance.getEntriesByType("measure"));