Update commit-mutation.md (#4346)

Summary:
This page describes how to use `commitMutation` and includes a code snippet. The snippet contains a typo. This PR fixes the typo by having the snippet import `commitMutation` instead of `useMutation`.

Pull Request resolved: #4346

Reviewed By: tyao1

Differential Revision:
D46782486

Privacy Context Container: L1125407

Pulled By: captbaritone

fbshipit-source-id: c0de54b49f4fc1603e608306ea3b7cbabbb551ef

website/versioned_docs/version-v14.0.0/api-reference/relay-runtime/commit-mutation.md

@@ -22,7 +22,7 @@ See also the [`useMutation`](../use-mutation/) API and [Guide to Updating Data](
 import type {FeedbackLikeMutation} from 'FeedbackLikeMutation.graphql';
 const React = require('React');
 
-const {graphql, useMutation} = require('react-relay');
+const {graphql, commitMutation} = require('react-relay');
 
 function likeFeedback(environment: IEnvironment): Disposable {
   return commitMutation<FeedbackLikeMutation>(environment, {