Fix missing return annotation in get_customer docs

[Skeen]

Description

The example under: "Defining extra types when using Interfaces" on https://strawberry.rocks/docs/types/schema contains an example, which does not run.

Using the documentation as-is produces this error:

MissingReturnAnnotationError: Return annotation missing for field "get_customer", did you forget to add it?

Types of Changes

• [ ] Core
• [ ] Bugfix
• [ ] New feature
• [ ] Enhancement/optimization
• [X] Documentation

Issues Fixed or Closed by This PR

*

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

Summary by Sourcery

Correct the return annotation in the 'get_customer' function example in the documentation to prevent runtime errors and improve clarity.

Documentation:

• Fix the missing return annotation in the 'get_customer' function example in the documentation to ensure it runs without errors.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request fixes a missing return annotation in the documentation example for the get_customer method. The change addresses an error that users would encounter when trying to run the example as-is from the documentation.

File-Level Changes

Change	Details	Files
Added missing return annotation to the get_customer method example	Added -> Customer as the return type annotation for the get_customer method Removed the commented-out return type annotation	docs/types/schema.md

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