Fix some typos

Change-Id: I3be73c2a4d256a0d28e863fd2517a4d7442b34d8
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

src/plugins/android/androidmanifesteditorwidget.cpp

@@ -499,7 +499,7 @@ bool AndroidManifestEditorWidget::open(QString *errorString, const QString &file
             return true;
         }
     }
-    // some error occured
+    // some error occurred
     updateInfoBar(error, errorLine, errorColumn);
     setActivePage(Source);
     return true;