suggest removing return type on use of void

[euclio]

Fixes #100972 (comment).

This PR suggests removing the return type entirely if the user writes -> void, expecting it to work like C or TypeScript.

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[Kivooeo]

just wondering how often is possible to see this?

tbh i think is hard to know what user is meant by -> void, maybe user wanted to return c_void raw pointer, or they do have or had a void variable somewhere