No, but it is in the Apple Support Articles for Two-Step Verification and Two-Factor Authentication:
From the Two-Step support article: Two-step verification for Apple ID - Apple Support
You can generate an app-specific password from your Apple ID account page and enter it into the password field of the app that you want to sign in to. This allows you to sign in securely even if the app you’re using doesn’t support entering verification codes. For example, you might use an app-specific password to sign in to iCloud using a third-party email, address book, or calendar app.
If you want to generate an app-specific password, sign in to your Apple ID account page. In the Security section, click Edit > Generate Password.
Learn more about app-specific passwords.
From the Two-Factor support article: Two-factor authentication for Apple ID - Apple Support
With two-factor authentication, you need an app-specific password to sign in to your account using third-party apps or services such as email, contacts, or calendar apps not provided by Apple. Follow these steps to generate an app-specific password:
- Sign in to your Apple ID account page.
- Click Generate Password below App-Specific Passwords.
- Follow the steps on your screen.
After you generate your app-specific password, enter or paste it into the password field of the app as you would normally.
You might want to provide feedback to Apple about adding this information to the iCloud Email Support Article: Apple - Feedback
Cheers,
GB