[chore] fix + update swagger docs

[tsmethurst]

Description

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This PR fixes a small issue with the swagger docs, and also regenerates them to make sure everything is up to date.

Swagger version (installed with go install:

version: v0.30.4
commit: (unknown, mod sum: "h1:cPrWLSXY6ZdcgfRicOj0lANg72TkTHz6uv/OlUdzO5U=")

Checklist

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• I/we have read the GoToSocial contribution guidelines.