fix link

Author: gaearon

content/blog/2020-08-10-react-v17-rc.md

@@ -333,7 +333,7 @@ Refer to the documentation for [detailed installation instructions](/docs/instal
 * Fix a false positive warning when `dangerouslySetInnerHTML` is `undefined`. ([@eps1lon](https://github.com/eps1lon) in [#18676](https://github.com/facebook/react/pull/18676))
 * Fix Test Utils with non-standard `require` implementation. ([@just-boris](https://github.com/just-boris) in [#18632](https://github.com/facebook/react/pull/18632))
 * Fix `onBeforeInput` reporting an incorrect `event.type`. ([@eps1lon](https://github.com/eps1lon) in [#19561](https://github.com/facebook/react/pull/19561))
-* Fix `event.relatedTarget` reported as `undefined` in Firefox. ([@claytercek](https://github.com/claytercek) in [#19664](https://github.com/facebook/react/pull/19664))
+* Fix `event.relatedTarget` reported as `undefined` in Firefox. ([@claytercek](https://github.com/claytercek) in [#19607](https://github.com/facebook/react/pull/19607))
 * Fix "unspecified error" in IE11. ([@hemakshis](https://github.com/hemakshis) in [#19672](https://github.com/facebook/react/pull/19672))
 * Fix rendering into a shadow root. ([@Jack-Works](https://github.com/Jack-Works) in [#15894](https://github.com/facebook/react/pull/15894))
 * Fix `movementX/Y` polyfill with capture events. ([@gaearon](https://github.com/gaearon) in [#19333](https://github.com/facebook/react/pull/19333))