Refactor Depth-To-Space operator

PiperOrigin-RevId: 342119823
diff --git a/src/operator-strings.c b/src/operator-strings.c
index 5971126..050f29d 100644
--- a/src/operator-strings.c
+++ b/src/operator-strings.c
@@ -63,7 +63,7 @@
     case xnn_operator_type_deconvolution_nhwc_qu8:
       return "Deconvolution (NHWC, QU8)";
     case xnn_operator_type_depth_to_space_nchw2nhwc_x32:
-      return "DepthToSpace (NCHW2NHWC, X32)";
+      return "Depth To Space (NCHW2NHWC, X32)";
     case xnn_operator_type_divide_nd_f32:
       return "Divide (ND, F32)";
     case xnn_operator_type_floor_nc_f32: