fix(docs): Update ut-api.mdx to match type defs

[FortyGazelle700]

Looking at uploadthing/packages/uploadthing/src/sdk/types.ts lines 83-85 I see the following lines of code that do not match the documentation.

type KeyRename = { key: string; newName: string };
type CustomIdRename = { customId: string; newName: string };
export type RenameFileUpdate = KeyRename | CustomIdRename;

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