Rollup merge of rust-lang#141648 - GuillaumeGomez:redundant_explicit_links-expansion, r=lolbinarycat

[rustdoc] Do not emit redundant_explicit_links lint if the doc comment comes from expansion

Fixes rust-lang#141553.

The problem was that we change the context for the attributes in some cases to get better error output, preventing us to detect if the attribute comes from expansion. Most of the changes are about keeping track of the "does this span comes from expansion" information.

r? ```@Manishearth```

Author: matthiaskrgr

clippy_lints/src/doc/mod.rs

@@ -765,8 +765,8 @@ impl Fragments<'_> {
     /// get the span for the markdown range. Note that this function is not cheap, use it with
     /// caution.
     #[must_use]
-    fn span(&self, cx: &LateContext<'_>, range: Range<usize>) -> Option<Span> {
-        source_span_for_markdown_range(cx.tcx, self.doc, &range, self.fragments)
+    fn span(self, cx: &LateContext<'_>, range: Range<usize>) -> Option<Span> {
+        source_span_for_markdown_range(cx.tcx, self.doc, &range, self.fragments).map(|(sp, _)| sp)
     }
 }