Fix typos of author lint

[tesuji]

changelog: none

[rustbot]

r? @Jarcho

rustbot has assigned @Jarcho.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[Jarcho]

I don't really see the need for using ast::LitKind. The compiler's error message for trying to use LitKind without importing mentions the full path. I think the same thing happens if you try to import it from rustc_hir as well.

[tesuji]

It's true that in compiler error message we see the hints about import path.
However recompiling clippy is never fast enough. But that's only my opinion. So don't mind me.

I removed the ast prefix.

[Jarcho]

Thank you. @bors r+

[bors]

📌 Commit 2855a87 has been approved by Jarcho

It is now in the queue for this repository.

[bors]

⌛ Testing commit 2855a87 with merge aaade2d...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: Jarcho
Pushing aaade2d to master...