Update custom-domains-with-fly.html.md

[vorant94]

Summary of changes

As fly certs --help shows there is no more fly certs create command. Based on the commands that are there, I assume it was replaces with fly certs add, so I suppose this particular documentation page is out of date, hence here is the fix

the output of fly certs --help:

Manages the certificates associated with a deployed application. Certificates are created by associating a
hostname/domain with the application. When Fly is then able to validate that hostname/domain, the platform gets
certificates issued for the hostname/domain by Let's Encrypt.

Usage:
  fly certs [command]

Available Commands:
  add         Add a certificate for an app.
  check       Checks DNS configuration
  list        List certificates for an app.
  remove      Removes a certificate from an app
  show        Shows certificate information

Flags:
  -h, --help   help for certs

Global Flags:
  -t, --access-token string   Fly API Access Token
      --debug                 Print additional logs and traces
      --verbose               Verbose output

Use "fly certs [command] --help" for more information about a command.

Preview

Related Fly.io community and GitHub links

Notes