Avoid ref when using format! in compiler

Clean up a few minor refs in `format!` macro, as it has a performance cost. Apparently the compiler is unable to inline `format!("{}", &variable)`, and does a run-time double-reference instead (format macro already does one level referencing).  Inlining format args prevents accidental `&` misuse.

compiler/rustc_resolve/src/rustdoc.rs

@@ -339,7 +339,7 @@ pub fn strip_generics_from_path(path_str: &str) -> Result<Box<str>, MalformedGen
         }
     }
 
-    debug!("path_str: {:?}\nstripped segments: {:?}", path_str, &stripped_segments);
+    debug!("path_str: {path_str:?}\nstripped segments: {stripped_segments:?}");
 
     let stripped_path = stripped_segments.join("::");