Help message is not properly rendered for oras attach

[shizhMSFT]

What happened in your environment?

$ oras attach --help
...
Flags:
...
      --distribution-spec string                   [Preview] set OCI distribution spec version and API option for target. Options: %!(EXTRA string=v1.1-referrers-tag, v1.1-referrers-api)
...

Options is not rendered correctly.

What did you expect to happen?

It should be corrected as

Options: v1.1-referrers-tag, v1.1-referrers-api

How can we reproduce it?

Run oras attach --help

What is the version of your ORAS CLI?

Version: 1.1.0+unreleased
Go version: go1.21.0
Git commit: 564bd32
Git tree state: clean

What is your OS environment?

Ubuntu 22.04

Are you willing to submit PRs to fix it?

• Yes, I am willing to fix it.

[FeynmanZhou]

It is renderer correctly on my Ubuntu machine.

 --distribution-spec string                   [Preview] set OCI distribution spec version and API option for target. options: v1.1-referrers-api, v1.1-referrers-tag

My ORAS version:

$ oras version
Version:        1.2.0-format
Go version:     go1.21.0
Git commit:     7728d49458b06843f9d056da405971b352f4a683
Git tree state: clean