test: unclear error with _toc.html #21912

=== release test-make-doc ===
Path: doctool/test-make-doc
assert.js:338
    throw err;
    ^

AssertionError [ERR_ASSERTION]: _toc.html does not not match TOC
    at Object.<anonymous> (/Users/matteo/Repositories/node/test/doctool/test-make-doc.js:45:10)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
    at startup (internal/bootstrap/node.js:266:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:596:3)
Command: out/Release/node /Users/matteo/Repositories/node/test/doctool/test-make-doc.js