Typo fix in the release announcement (#6318)

Author: svfat

docs/community/3.9-announcement.md

@@ -168,7 +168,7 @@ Both `APIView.exclude_from_schema` and the `exclude_from_schema` argument to the
 
 For `APIView` you should instead set a `schema = None` attribute on the view class.
 
-For function based views the `@schema` decorator can be used to exclude the view from the schema, by using `@schema(None)`.
+For function-based views the `@schema` decorator can be used to exclude the view from the schema, by using `@schema(None)`.
 
 ---
 
@@ -179,7 +179,7 @@ There are a large number of minor fixes and improvements in this release. See th
 
 ## What's next
 
-We're planning to iteratively working towards OpenAPI becoming the standard schema
+We're planning to iteratively work towards OpenAPI becoming the standard schema
 representation. This will mean that the `coreapi` dependency will gradually become
 removed, and we'll instead generate the schema directly, rather than building
 a CoreAPI `Document` object.
@@ -200,7 +200,7 @@ with the possibility that some of this work will eventually [feed back into
 Django](https://www.aeracode.org/2018/06/04/django-async-roadmap/).
 
 There will be further work on the [Uvicorn](https://www.uvicorn.org/)
-webserver, as well as lots of functionality planned for the [Starlette](https://www.starlette.io/)
+web server, as well as lots of functionality planned for the [Starlette](https://www.starlette.io/)
 web framework, which is building a foundational set of tooling for working with
 ASGI.