message: Clean out old files from rush docs on buildDocSite
diff: @@ -27,6 +27,9 @@ runBemetalsmith();
  //Rush docs
  function runDocs() {
  + // Clean generated-docs
  + fs.removeSync(path.resolve(process.cwd(), "generated-docs"));
  +
  const docsProcess = childProcess.execSync("rush docs", { stdio: [0, 1, 2] });
  }
  