fix maskrcnn readme for pytorch<=1.11
@@ -7,7 +7,7 @@ This document describes the step-by-step instructions for reproducing PyTorch MA
### 1. Installation
-PyTorch 1.8 or higher version is needed with pytorch_fx backend.
+PyTorch >=1.8 and <=1.11 version is needed with pytorch_fx backend.
```shell
cd examples/pytorch/object_detection/maskrcnn/quantization/ptq/fx
