updated Changelog

Author: ItayGibel-helios

Diff for: CHANGELOG.md

@@ -9,8 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
-- `opentelemetry-instrumentation-urllib3` Added `_ExtendedRequestHookT` as an optional type of `request_hook`.
-   this type extends the existing `_RequestHookT` with two more fields - the request body and the request headers
+- `opentelemetry-instrumentation-urllib3` Updated `_RequestHookT` with two additional fields - the request body and the request headers
+([#660](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/660))
 
 ## [1.5.0-0.24b0](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.5.0-0.24b0) - 2021-08-26