Register tool docs for compiletest

src/bootstrap/src/core/build_steps/doc.rs

@@ -1058,6 +1058,13 @@ tool_doc!(
     is_library = true,
     crates = ["run_make_support"]
 );
+tool_doc!(
+    Compiletest,
+    "src/tools/compiletest",
+    rustc_tool = false,
+    is_library = true,
+    crates = ["compiletest"]
+);
 
 #[derive(Ord, PartialOrd, Debug, Clone, Hash, PartialEq, Eq)]
 pub struct ErrorIndex {

src/bootstrap/src/core/builder.rs

@@ -945,6 +945,7 @@ impl<'a> Builder<'a> {
                 doc::Releases,
                 doc::RunMakeSupport,
                 doc::BuildHelper,
+                doc::Compiletest,
             ),
             Kind::Dist => describe!(
                 dist::Docs,