(doc) Mention requiring closing Reddit http connection

Author: Andrew-Chen-Wang

docs/getting_started/quick_start.rst

@@ -157,6 +157,16 @@ to read-only mode whenever you want:
     If you are uncomfortable hard-coding your credentials into your program, there are
     some options available to you. Please see: :ref:`configuration`.
 
+Close Connections in :class:`.Reddit`
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The asynchronous context requires closing your session when you finish using Reddit:
+
+.. code-block:: python
+
+    reddit = asyncpraw.Reddit(...)
+    await reddit.close()
+
 Obtain a :class:`.Subreddit`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~