fix typo

Author: salty-ivy

docs/installation.rst

@@ -9,7 +9,7 @@ fully functional.
 
 .. warning::
 
-    The Debug Toolbar now supports `Django's asynchronous views <https://docs.djangoproject.com/en/dev/topics/async/>`_ and ASGI enviroment, but
+    The Debug Toolbar now supports `Django's asynchronous views <https://docs.djangoproject.com/en/dev/topics/async/>`_ and ASGI environment, but
     still lacks the capability for handling concurrent requests.
 
 1. Install the Package