API Docs suggests way more fields can be used in POST

[darioackermann]

Describe the bug

The API Docs specify that createTime and its update and display equivalents, as well as state, for example, can be specified on a POST request. They can be, but are not used or set on the new memo (#4573, #4525) so this is misleading and should be removed from the docs.

The only possible way to achieve this currently is PATCHing the memo afterwards.

Steps to reproduce

1. Check out the API Docs

The version of Memos you're using

0.24.2

Screenshots or additional context

No response