Update clippy source code to changes on source_span_for_markdown_range

Author: GuillaumeGomez

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)
     }
 }