Fix typo in editor note in NOTES.md

Author: KentZetterberg

NOTES.md

@@ -1,6 +1,6 @@
 <!-- NOTE FOR  EDITORS OF THIS FILE 
 This file is linked to from the EWARM 10.10 release notes regarding "Missing CMSIS headers". 
-This should be taken into account when chaing the file 
+This should be taken into account when changing the file. 
 END OF NOTE -->
 
 ## Important Notes