Update README.md

README.md

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 # Detectron2 Cascade-RCNN with FPN and Group Normalization on ResNext32xd4-50 trained on Publaynet for Document Layout Analysis
 
 The model and has been trained with the Tensorflow training toolkit Tensorpack and then transferred to Pytorch using a conversion script. 
-The Tensorflow and Pytorch models differ slightly (padding ...), however validating the both models give and difference of < 0.03 mAP.   
+The Tensorflow and Pytorch models differ slightly (padding ...), however validating both models give a difference of less than 0.03 mAP.   
 
 Please check: [Xu Zhong et. all. - PubLayNet: largest dataset ever for document layout analysis](https://arxiv.org/abs/1908.07836).