typo "Should"

IPython/html/static/notebook/js/notebook.js

@@ -2223,7 +2223,7 b' define(function (require) {'
                     name: "(No name)",
                     language: this.metadata.language
                   });
-                // this shoudl be stored in kspec now, delete it.
+                // this should be stored in kspec now, delete it.
                 // remove once we do not support notebook v3 anymore.
                 delete this.metadata.language;
             } else {