docs: Lexical custom server feature not using absolute import path

[todor0v]

I was following the instructions for adding a Lexical rich text custom feature and I had the problem that it was not showing in the admin panel within the Lexical editor. Following the Payload example, I noticed that an absolute path is used and the documentation (here) suggests a relative one. This fixed the issue.

Please let me know if I am mistaken or if there is a better way to suggest not using a relative path to the ClientFeature component.

[github-actions]

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