Reformat use declarations.

The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.

compiler/rustc_span/src/edit_distance.rs

@@ -9,9 +9,10 @@
 // algorithm should not matter to the caller of the methods, which is why it is not noted in the
 // documentation.
 
-use crate::symbol::Symbol;
 use std::{cmp, mem};
 
+use crate::symbol::Symbol;
+
 #[cfg(test)]
 mod tests;