Improving comments.

Author: daxpedda

clippy_lints/src/use_self.rs

@@ -58,8 +58,7 @@ const SEGMENTS_MSG: &str = "segments should be composed of at least 1 element";
 fn span_use_self_lint(cx: &LateContext<'_, '_>, path: &Path) {
     // path segments only include actual path, no methods or fields
     let last_path_span = path.segments.last().expect(SEGMENTS_MSG).ident.span;
-    // `to()` doesn't shorten span, so we shorten it with `until(..)`
-    // and then include it with `to(..)`
+    // only take path up to the end of last_path_span
     let span = path.span.with_hi(last_path_span.hi());
 
     span_lint_and_sugg(