Rollup merge of rust-lang#95809 - ytmimi:llvm_stamp_typo, r=Mark-Simulacrum

Fix typo in bootstrap.py

Author: Dylan-DPC

src/bootstrap/bootstrap.py

@@ -817,7 +817,7 @@ def rustfmt_stamp(self):
         return os.path.join(self.bin_root(True), '.rustfmt-stamp')
 
     def llvm_stamp(self):
-        """Return the path for .rustfmt-stamp
+        """Return the path for .llvm-stamp
 
         >>> rb = RustBuild()
         >>> rb.build_dir = "build"