docs: fix PhpStorm spelling errors

Author: kenjis

public/index.php

@@ -47,7 +47,7 @@
  * ---------------------------------------------------------------
  *
  * The CodeIgniter class contains the core functionality to make
- * the application run, and does all of the dirty work to get
+ * the application run, and does all the dirty work to get
  * the pieces all working together.
  */
 
@@ -60,7 +60,7 @@
  *---------------------------------------------------------------
  * LAUNCH THE APPLICATION
  *---------------------------------------------------------------
- * Now that everything is setup, it's time to actually fire
+ * Now that everything is set up, it's time to actually fire
  * up the engines and make this app do its thang.
  */