Rollup merge of #129695 - GuillaumeGomez:fix-clippy-rustdoc-path, r=onur-ozkan

Fix path to run clippy on rustdoc

Took me a while to find out that the path clippy expected was `src/tools/rustdoc` and not `src/librustdoc`. I think it makes more sense this way as most commands rely on source paths.

r? ```@Kobzol```

Author: workingjubilee