Fix typo in Releases.md (facebook#20487)

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Pull Request resolved: facebook#20487

Differential Revision: D9117645

Pulled By: hramos

fbshipit-source-id: f1fc725b28ed606175baba19fa165a7add12da43

Releases.md

@@ -65,7 +65,7 @@ Circle CI will automatically run the tests and publish to npm with the version y
 
 ### Step 3: Write the release notes
 
-Write the release notes, or post in [React Native Core Contributors](https://www.facebook.com/groups/reactnativeoss/) that the RC is ready to find a voluteer. You can also use [react-native-release-notes](https://github.com/knowbody/react-native-release-notes) to generate a draft of release notes.
+Write the release notes, or post in [React Native Core Contributors](https://www.facebook.com/groups/reactnativeoss/) that the RC is ready to find a volunteer. You can also use [react-native-release-notes](https://github.com/knowbody/react-native-release-notes) to generate a draft of release notes.
 
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