Missing details in GHC-90584

[andreasabel]

error-message-index/message-index/messages/GHC-90584/index.md

Lines 9 to 10 in 6b3fd8c

	This warning occurs when trying to derive an instance of the `Typeable` class.
	Deriving `Typeable` is not necessary as all types automatically derive `Typeable`.

I am missing the information here:

• since when does deriving Typeable have no effect (starting with which GHC version)?
• link to GHC documentation of the mentioned warning/option

Answers to be integrated in error explanation:

• https://downloads.haskell.org/ghc/latest/docs/users_guide/using-warnings.html#ghc-flag-Wderiving-typeable
• since 7.10

[Bodigrim]

PRs are welcome :)