Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/net/iw_handler.h b/include/net/iw_handler.h
index 3afdb21..5d5a6a4 100644
--- a/include/net/iw_handler.h
+++ b/include/net/iw_handler.h
@@ -91,7 +91,7 @@
  * --------------------
  * The implementation goals were as follow :
  *	o Obvious : you should not need a PhD to understand what's happening,
- *		the benefit is easier maintainance.
+ *		the benefit is easier maintenance.
  *	o Flexible : it should accommodate a wide variety of driver
  *		implementations and be as flexible as the old API.
  *	o Lean : it should be efficient memory wise to minimise the impact
@@ -129,7 +129,7 @@
  *
  * Functions prototype uses union iwreq_data
  * -----------------------------------------
- * Some would have prefered functions defined this way :
+ * Some would have preferred functions defined this way :
  *	static int mydriver_ioctl_setrate(struct net_device *dev, 
  *					  long rate, int auto)
  * 1) The kernel code doesn't "validate" the content of iwreq_data, and