Update README.md for instance_segmentation

examples/instance_segmentation/README.md

@@ -4,7 +4,7 @@
 
 ```bash
 labelme data_annotated --labels labels.txt --nodata --validatelabel exact --config '{shift_auto_shape_color: -2}'
-labelme data_annotated --labels labels.txt --nodata --labelflags '{.*: [occluded, truncated], person-\d+: [male]}'
+labelme data_annotated --labels labels.txt --nodata --labelflags '{.*: [occluded, truncated], person: [male]}'
 ```
 
 ![](.readme/annotation.jpg)