Update explainer.md

Author: jan-ivar

explainer.md

@@ -122,8 +122,8 @@ of an encoded frame and adds 4 bytes of padding.
         const view = new DataView(encodedFrame.data);
 
         // Ignore the last 4 bytes
-        let newData = new ArrayBuffer(encodedFrame.data.byteLength - 4);
-        let newView = new DataView(newData);
+        const newData = new ArrayBuffer(encodedFrame.data.byteLength - 4);
+        const newView = new DataView(newData);
 
         // Negate all bits in the incoming frame, ignoring the
         // last 4 bytes
@@ -311,4 +311,3 @@ correspondingly larger implementation effort, and would offer less flexibility
 in how the processing elements could be implemented.
 
 
-