[vim/vim] runtime(doc): fix return type info (PR #21102)

Some functions will return an empty list for error, which will have a
`list<any>` type name. But that is needless.

`sign_placelist()`'s return type is wrong.

You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21102

-- Commit Summary --

  * runtime(doc): fix return type info

-- File Changes --

    M runtime/doc/builtin.txt (48)
    M runtime/doc/sign.txt (6)

-- Patch Links --

https://github.com/vim/vim/pull/21102.patch
https://github.com/vim/vim/pull/21102.diff

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