Add --format flag to score-k8s generate CLI reference

[Abhishek9639]

What is the motivation?

score-k8s 0.15.0 just shipped a new --format flag on the generate command (score-spec/score-k8s#321). After that PR was merged, @mathieu-benoit asked me to add the flag to the CLI reference once the release was out: score-spec/score-k8s#321 (comment). The page doesn't mention it yet, so anyone reading the docs today wouldn't know the flag exists.

What does this change do?

Adds a --format entry to the generate flags section of the score-k8s CLI reference. It's a small addition: a one-line description and a bash example, same shape as the other flag entries on that page, placed in alphabetical order before --generate-namespace. The wording follows the flag's help text in 0.15.0: the output format can be yaml or kyaml, and it defaults to yaml so nothing changes for anyone who doesn't opt in.

What is your testing strategy?

Docs-only change, no code. I checked the description against the released flag's --help output and kept the markdown consistent with the neighbouring entries so it renders the same way on the page.

Is this related to any issues?

• feat: add --format flag to generate KYAML manifests score-k8s#321 (the PR that added the flag)
• [feature request] Export manifests to KYAML score-k8s#198 (the original feature request for KYAML output)

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[Abhishek9639]

@mathieu-benoit as promised on score-spec/score-k8s#321, here's the doc update for the new --format flag now that 0.15.0 is out. Small one, just the flag entry added to the generate section. Ready for review whenever you get a chance.
Thanks!

[mathieu-benoit]

LGTM, thanks @Abhishek9639!