clarify comment and add autolink test case

Author: erhuve

crates/ide/src/doc_links.rs

@@ -363,7 +363,7 @@ fn map_links<'e>(
     let mut end_link_target: Option<CowStr> = None;
     // normally link's type is determined by the type of link tag in the end event,
     // however in some cases we want to change the link type, for example,
-    // `Shortcut` type doesn't make sense for url links
+    // `Shortcut` type parsed from Start/End tags doesn't make sense for url links
     let mut end_link_type: Option<LinkType> = None;
 
     events.map(move |evt| match evt {

crates/ide/src/hover/tests.rs

@@ -3808,6 +3808,7 @@ fn foo() {
 /// [closure]
 /// [closures][closure]
 /// [threads]
+/// <https://doc.rust-lang.org/nightly/book/ch13-01-closures.html>
 ///
 /// [closure]: ../book/ch13-01-closures.html
 /// [threads]: ../book/ch16-01-threads.html#using-move-closures-with-threads
@@ -3825,6 +3826,7 @@ mod move_keyword {}
             [closure](https://doc.rust-lang.org/nightly/book/ch13-01-closures.html)
             [closures](https://doc.rust-lang.org/nightly/book/ch13-01-closures.html)
             [threads](https://doc.rust-lang.org/nightly/book/ch16-01-threads.html#using-move-closures-with-threads)
+            <https://doc.rust-lang.org/nightly/book/ch13-01-closures.html>
         "##]],
     );
 }