Remove extra period from sentence (#2601)

docs/deploy_streamlit_app.md

@@ -141,8 +141,7 @@ Here are some limitations and known issues that we're actively working to resolv
 - **If you're having trouble logging in,** check your Streamlit sharing invitation email and make sure you signed up using your Primary Github email, which you can find [here](https://github.com/settings/emails).
 - When you print something to the terminal, you may need to do a `sys.stdout.flush()` before it shows up.
 - Apps execute in a Linux environment running Debian Buster (slim) with Python 3.7. There is no way to change these, and we may upgrade the environment at any point. If we do upgrade it, we will _usually_ not touch existing apps, so they'll continue to work as expected. But if there's a critical fix in the update, we _may_ force-upgrade all apps.
-- Matplotlib [doesn't work well with threads.](https://matplotlib.org/3.3.2/faq/howto_faq.html#working-with-threads)
-  . So if you're using Matplotlib you should wrap your code with locks as shown in the snippet below. This Matplotlib bug is more prominent when you share your app apps since you're more likely to get more concurrent users then.
+- Matplotlib [doesn't work well with threads](https://matplotlib.org/3.3.2/faq/howto_faq.html#working-with-threads). So if you're using Matplotlib you should wrap your code with locks as shown in the snippet below. This Matplotlib bug is more prominent when you share your app apps since you're more likely to get more concurrent users then.
 
   ```python
   from matplotlib.backends.backend_agg import RendererAgg