add doc links generation in definitions

disable-cfg-doc.patch

@@ -0,0 +1,22 @@
+diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
+index 375f833831..942dba29e6 100644
+--- a/src/librustdoc/core.rs
++++ b/src/librustdoc/core.rs
+@@ -202,7 +202,7 @@ pub(crate) fn create_config(
+         diagnostic_width,
+         libs,
+         externs,
+-        mut cfgs,
++        cfgs,
+         check_cfgs,
+         codegen_options,
+         unstable_opts,
+@@ -220,7 +220,7 @@ pub(crate) fn create_config(
+     render_options: &RenderOptions,
+ ) -> rustc_interface::Config {
+     // Add the doc cfg into the doc build.
+-    cfgs.push("doc".to_string());
++    // cfgs.push("doc".to_string());
+ 
+     // By default, rustdoc ignores all lints.
+     // Specifically unblock lints relevant to documentation or the lint machinery itself.