Update verify-artifact for helm chart

[liangyuanpeng]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Update doc of verify-artifact for helm chart.

Related:

• feat:sign image for helm chart karmada#3841
• Let images of kamada signed with cosign karmada#3435

TODO also update to doc of zh.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

[karmada-bot]

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[karmada-bot]

Welcome @liangyuanpeng! It looks like this is your first PR to karmada-io/website 🎉

[windsonsea]

Text suggestions if my understanding is not wrong.

[windsonsea]

Suggested change

	> Note: image of helm chart introduced the `cosign` verification tool since release 1.8.
	> Note: The image of the helm chart has introduced the `cosign` verification tool since Karmada v1.8.

[liangyuanpeng]

Karmada v1.8.

Thanks for review, The doc is really have style like Karmada introduced the cosignverification tool since release 1.7., This may not need to be modified for consistency?

[RainbowMango]

I can't understand why adding the notes under this chapter.
If we want to demonstrate how to verify Charts, we might need to organize the content as:

# Overview

## Images
## Charts    // new chapter
## Binaries

Note that this chapter is reserved when we setup the document at #449 (review).

[windsonsea]

This small PR has remained for 9 months while it has conflicts. Feel free to re-open it if you have more suggestions, thanks.

/close

[karmada-bot]

@windsonsea: Closed this PR.

In response to this:

This small PR has remained for 9 months while it has conflicts. Feel free to re-open it if you have more suggestions, thanks.

/close

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