Stop importing int modules in librustdoc

src/librustdoc/clean/mod.rs

@@ -32,7 +32,6 @@
 use std::default::Default;
 use std::hash::Hash;
 use std::rc::Rc;
-use std::u32;
 use std::{mem, vec};
 
 use crate::core::{self, DocContext, ImplTraitParam};

src/librustdoc/passes/unindent_comments.rs

@@ -1,6 +1,5 @@
 use std::cmp;
 use std::string::String;
-use std::usize;
 
 use crate::clean::{self, DocFragment, Item};
 use crate::core::DocContext;