bootstrap: remove unused comment

resolver-tests is for test only so no need to document it.

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

@@ -1004,8 +1004,6 @@ fn run(self, builder: &Builder<'_>) {
         "crates-io",
         "mdman",
         "rustfix",
-        // FIXME: this trips a license check in tidy.
-        // "resolver-tests",
     ]
 );
 tool_doc!(Tidy, "tidy", "src/tools/tidy", rustc_tool = false, crates = ["tidy"]);