py/mpstate.h: Remove obsolete comment about nlr_top being coded in asm.

py/mpstate.h

@@ -215,7 +215,6 @@ typedef struct _mp_state_thread_t {
     mp_obj_dict_t *dict_locals;
     mp_obj_dict_t *dict_globals;
 
-    // Note: nlr asm code has the offset of this hard-coded
     nlr_buf_t *nlr_top; // ROOT POINTER
 
     // Stack top at the start of program