Rollup merge of #89217 - GuillaumeGomez:generate-link-to-def-rust-tools, r=jyn514

Enable "generate-link-to-definition" option on rust tools docs as well

Just realized that we enable the option for the compiler crates, but we don't have it for rustdoc and the other tools documentation...

Part of #89095.

cc ``@rust-lang/rustdoc``
r? ``@Mark-Simulacrum``

Author: workingjubilee

src/bootstrap/doc.rs

@@ -743,6 +743,7 @@ macro_rules! tool_doc {
                 cargo.rustdocflag("--document-private-items");
                 cargo.rustdocflag("--enable-index-page");
                 cargo.rustdocflag("--show-type-layout");
+                cargo.rustdocflag("--generate-link-to-definition");
                 cargo.rustdocflag("-Zunstable-options");
                 builder.run(&mut cargo.into());
             }