Out-of-date links in resolver docs

### Issue workflow progress

_Progress of the issue based on the
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- [ ] 1. The issue provides a reproduction available on Github, Stackblitz or CodeSandbox
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- [ ] 2. A failing test has been provided
- [ ] 3. A local solution has been provided
- [ ] 4. A pull request is pending review

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**Describe the bug**

In the [Resolver Function Signature](https://the-guild.dev/graphql/tools/docs/resolvers#resolver-function-signature) section of the docs, there are two links to https://github.com/graphql/express-graphql#options/ in steps 1 and 3. This link is to an archived GitHub repository and the `#options` anchor doesn't work.

**To Reproduce** Steps to reproduce the behavior:

See above

**Expected behavior**

The links in the docs should go to a more appropriate place.

**Environment:**

N/A

**Additional context**

None

Open the Resolver Function Signature section at the linked resolver documentation page and locate the two express-graphql options links in steps 1 and 3. Check the current appropriate destination for that reference, update both links, and verify that they resolve to a valid, relevant page and anchor.

Written by the indexing model from the issue text.