Added public domain license text

stb_textedit.h

@@ -17,9 +17,9 @@
 //
 // LICENSE
 //
-// This software has been placed in the public domain by its author.
-// Where that dedication is not recognized, you are granted a perpetual,
-// irrevocable license to copy and modify this file as you see fit.
+//   This software is in the public domain. Where that dedication is not
+//   recognized, you are granted a perpetual, irrevocable license to copy,
+//   distribute, and modify this file as you see fit.
 //
 //
 // DEPENDENCIES