GraphQL: Add docs for assignCustomerToGuestCart mutation

[keharper]

Community engineering issue

Type of Doc:

• New topic
• Topic Update, Devdoc link:
• Other

Magento 2 GitHub Issue: magento/magento2#32615

Magento 2 GitHub PR: magento/magento2#33106

Magento 2 version:

• 2.4

Notifications of Changes:

• Changes to Admin interface?
• New software requirements?
• New REST endpoints or updated GraphQL query syntax?
• New command line option?

Content

Add documentation for the assignCustomerToGuestCart mutation. The new topic must include a general description of the mutation, the syntax, a working example, and the output fields. The mergeCarts documentation can be used as a template for this new topic.

Place the topic in the src/guides/v2.4/graphql/mutations directory.

Also add a link to the new topic in TOC file at src/_data/toc/graphql.yml

Additional information

[m2-assistant]

Hi @keharper. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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[karyna-t]

@magento I am working on this

[keharper]

Fixed in #9252