Type MutationResult.reset as an arrow function

[JavaScriptBach]

Type Mutation.reset as an arrow function.

This function doesn't depend on this, so it can be safely passed around as value. Typing this as an arrow function makes it clear and plays nicer with https://typescript-eslint.io/rules/unbound-method/

[apollo-cla]

@JavaScriptBach: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[netlify]

✅ Deploy Preview for apollo-client-docs ready!

Name	Link
🔨 Latest commit	d9ab0d1
🔍 Latest deploy log	https://app.netlify.com/sites/apollo-client-docs/deploys/66cc98d601565a0008c244eb
😎 Deploy Preview	https://deploy-preview-12027--apollo-client-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[changeset-bot]

🦋 Changeset detected

Latest commit: 59bc64b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@apollo/client	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[phryneas]

That's a really good call, thank you for the PR!