Fix code comment typo

Created by: bestseob93

explictly to explicitly

packages/react-scripts/scripts/start.js

@@ -77,7 +77,7 @@ if (process.env.HOST) {
   console.log();
 }
 
-// We require that you explictly set browsers and do not fall back to
+// We require that you explicitly set browsers and do not fall back to
 // browserslist defaults.
 const { checkBrowsers } = require('react-dev-utils/browsersHelper');
 checkBrowsers(paths.appPath, isInteractive)