Update pitcher leaderboard name

pitcher_leaderboard.py

@@ -114,7 +114,7 @@ def create_pitcher_leaderboard():
   start_datetime_init = datetime(now.year, 1, 1)
   end_datetime_init = now
   with gr.Blocks() as app:
-    gr.Markdown('# Pitch Leaderboard')
+    gr.Markdown('# Pitcher Leaderboard')
     with gr.Row():
       start_date = gr.DateTime(start_datetime_init, include_time=False, type='datetime', label='Start')
       end_date = gr.DateTime(end_datetime_init, include_time=False, type='datetime', label='End')