Rollup merge of #112211 - eval-exec:exec/fix-bootstrap-rustdoc, r=ozkanonur

pass `--lib` to `x doc`

This PR want to close #112082

src/bootstrap/doc.rs

@@ -834,6 +834,7 @@ fn run(self, builder: &Builder<'_>) {
                 cargo.arg("-Zskip-rustdoc-fingerprint");
                 // Only include compiler crates, no dependencies of those, such as `libc`.
                 cargo.arg("--no-deps");
+                cargo.arg("--lib");
                 $(
                     cargo.arg("-p").arg($krate);
                 )+