minor fixes in the code

app.py

@@ -190,7 +190,16 @@ def kpi_chart() -> alt.Chart:
     return chart
 
 
-def render_hub_user_link(hub_id):
+def render_hub_user_link(hub_id:str) -> str:
+    """
+    This function returns a link to the user's profile on Hugging Face.
+
+    Args:
+        hub_id: The user's id on Hugging Face.
+
+    Returns:    
+        A string with the link to the user's profile on Hugging Face.
+    """
     link = f"https://huggingface.co/{hub_id}"
     return f'<a target="_blank" href="{link}" style="color: var(--link-text-color); text-decoration: underline;text-decoration-style: dotted;">{hub_id}</a>'
 
@@ -236,6 +245,16 @@ def fetch_data() -> None:
 
 
 def get_top(N = 50) -> pd.DataFrame:
+    """
+    This function returns the top N users with the most annotations.
+
+    Args:
+        N: The number of users to be returned. 50 by default
+
+    Returns:
+        A pandas dataframe with the top N users with the most annotations.
+    """
+
     return obtain_top_users(user_ids_annotations, N=N)