ggml-hexagon: fix a typo in ggml-hexagon.cpp

Author: zhouwg

ggml/src/ggml-hexagon/ggml-hexagon.cpp

@@ -5982,7 +5982,7 @@ const char * ggml_backend_hexagon_get_devname(size_t dev_num) {
             return "HEXAGON_BACKEND_CDSP";
     }
 
-    //here is the trick: fall through for various scenarios
+    //here is the trick: fall back for various scenarios
     switch (dev_num) {
         case HEXAGON_BACKEND_QNNCPU:
             return "HEXAGON_BACKEND_QNN_CPU";