Fix two small rough edges in info for source maps.

docs/javascript-debugging.html

@@ -603,7 +603,7 @@ that create source maps for CoffeeScript, SASS and many others. See the <a href=
 
 <p><strong>Configure DevTools</strong></p>
 
-<p>Sourcemaps are enabled by default (as of Chrome 39), but if you'd like to double-check our enable them, 
+<p>Sourcemaps are enabled by default (as of Chrome 39), but if you'd like to double-check or enable them, 
 first open DevTools and click the settings
 cog <img src="../images/gear.png" alt="gear">. Under <strong>Sources</strong>,
 check <strong>Enable  JavaScript source maps</strong>. You might also