doc: fix spelling error in lib/url.js comment

PR-URL: nodejs#4390
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

lib/url.js

@@ -586,7 +586,7 @@ Url.prototype.resolveObject = function(relative) {
     // Put this after the other two cases because it simplifies the booleans
     if (psychotic) {
       result.hostname = result.host = srcPath.shift();
-      //occationaly the auth can get stuck only in host
+      //occasionally the auth can get stuck only in host
       //this especially happens in cases like
       //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
       var authInHost = result.host && result.host.indexOf('@') > 0 ?
@@ -668,7 +668,7 @@ Url.prototype.resolveObject = function(relative) {
   if (psychotic) {
     result.hostname = result.host = isAbsolute ? '' :
                                     srcPath.length ? srcPath.shift() : '';
-    //occationaly the auth can get stuck only in host
+    //occasionally the auth can get stuck only in host
     //this especially happens in cases like
     //url.resolveObject('mailto:local1@domain1', 'local2@domain2')
     var authInHost = result.host && result.host.indexOf('@') > 0 ?