docs: Fix example in errors.md

[bricker]

Description

Fixes one of the examples in the "Dealing with errors" documentation. The example RegisterUserSuccess type has a single property user, which was missing in the example field selection.

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Documentation

Issues Fixed or Closed by This PR

n/a

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• 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

Documentation:

• Corrected the example in the 'Dealing with errors' documentation by adding the missing 'user' property in the 'RegisterUserSuccess' type field selection.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR fixes a documentation error in the GraphQL mutation example within the errors guide. The change corrects the field selection for the RegisterUserSuccess type by properly nesting the id and username fields under the user property.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated GraphQL mutation example to correctly show nested field selection	Added missing user field wrapper in the RegisterUserSuccess type Moved id and username fields to be nested under the user property	docs/guides/errors.md

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[sourcery-ai]

Hey @bricker - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[patrick91]

oh, well spotted! thank you so much!