Adds docstring and tweaks changelog

Per feedback by @Archmonger

Author: shawncrawley

docs/source/about/changelog.rst

@@ -70,7 +70,7 @@ Unreleased
 **Fixed**
 
 - :pull:`1239` - Fixed a bug where script elements would not render to the DOM as plain text.
-- :pull:`1271` - Fixed bug where JavaScript components were unable to obtain the ``key`` attribute provided within ReactPy.
+- :pull:`1271` - Fixed a bug where the ``key`` property provided via server-side ReactPy code was failing to propagate to the front-end JavaScript component.
 - :pull:`1254` - Fixed a bug where ``RuntimeError("Hook stack is in an invalid state")`` errors would be provided when using a webserver that reuses threads.
 
 v1.1.0

tests/test_web/test_module.py

@@ -209,6 +209,13 @@ async def test_imported_components_can_render_children(display: DisplayFixture):
 
 
 async def test_keys_properly_propagated(display: DisplayFixture):
+    """ Addresses issue #1271
+    The "key" property was being lost in its propagation from
+    the server-side ReactPy definition to the front-end JavaScript.
+    This is a critical issue for the proper functionality of
+    certain components, such as the GridLayout from 
+    react-grid-layout.
+    """
     module = reactpy.web.module_from_file(
         "keys-properly-propagated", JS_FIXTURES_DIR / "keys-properly-propagated.js"
     )