Fix model links

app.py

@@ -233,9 +233,11 @@ def plot_expression(arousal, dominance, valence):
 description = (
     "Estimate **age**, **gender**, and **expression** "
     "of the speaker contained in an audio file or microphone recording.  \n"
-    "The model [age_gender_model_name](https://huggingface.co/{age_gender_model_name}) "
+    f"The model [{age_gender_model_name}]"
+    f"(https://huggingface.co/{age_gender_model_name}) "
     "recognizes age and gender, "
-    "whereas [{expression_model_name}](https://huggingface.co/{expression_model_name}) "
+    f"whereas [{expression_model_name}]"
+    f"(https://huggingface.co/{expression_model_name}) "
     "recognises the expression dimensions arousal, dominance, and valence. "
 )