Update app.py

fixing in typo in markdown text.

app.py

@@ -270,7 +270,7 @@ with gr.Blocks() as demo:
       ## Detecting watermarked text
 
       The only way to properly detect watermarked text is with a trained
-      classifier. This Space uses a pre-trained classifier hosted on Huggin Face
+      classifier. This Space uses a pre-trained classifier hosted on Hugging Face
       Hub. For production uses you will need to train your own classifiers to
       recognize your watermarks. A [Bayesian detector][synthid-hf-detector] is
       provided in Transformers, along with an