Dead links on Configuration > CSRF chapter

[adrenth]

The CSRF chapter https://docs.octobercms.com/3.x/setup/configuration.html#csrf-protection contains dead links:

• https://docs.octobercms.com/3.x/services/html.html#opening-a-form
• https://docs.octobercms.com/3.x/services/html.html#form-tokens

[daftspunk]

This is fixed in: 4ded671

Thanks!