Improve message for WebP site health test

[the-hercules]

Fixes #715

Summary

Updated error message in the WordPress performance plugin regarding WebP image support. The message now informs users that WebP images require support from the web server's image processing libraries (Imagick or LibGD) and provides guidance on checking supported file formats.

[the-hercules]

@thelovekesh Some checks are failing due to missing labels, can you add labels to this PR?

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Unlinked Accounts

The following contributors have not linked their GitHub and WordPress.org accounts: @hercules@herculess-MacBook-Air.local, @aashish.sharma@rtcamp.com.

Contributors, please read how to link your accounts to ensure your work is properly credited in WordPress releases.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Unlinked contributors: hercules@herculess-MacBook-Air.local, aashish.sharma@rtcamp.com.

Co-authored-by: the-hercules <thehercules@git.wordpress.org>
Co-authored-by: mukeshpanchal27 <mukesh27@git.wordpress.org>
Co-authored-by: joemcgill <joemcgill@git.wordpress.org>
Co-authored-by: westonruter <westonruter@git.wordpress.org>
Co-authored-by: adamsilverstein <adamsilverstein@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[mukeshpanchal27]

Thanks for the PR. The link should be clickable.

[joemcgill]

Prior to merging these changes, I think we need to consider whether the updated text addresses the issue. See #715 (comment).

[westonruter]

@the-hercules new suggested text from @adamsilverstein in #715 (comment)

[the-hercules]

@westonruter does this message looks good ?

WebP support can only be enabled by your hosting provider. Please contact them to inquire about switching to a plan that supports WebP, or consider switching to a host that offers this feature. For more information about WebP image support for WordPress sites, please Learn more here.

[westonruter]

For more information about WebP image support for WordPress sites, please Learn more here.

I would phrase this rather as:

Learn more about WebP image support for WordPress sites.

I'll defer to @adamsilverstein for the ultimate wording.

[adamsilverstein]

Looks good, including suggestion from @westonruter

[westonruter]

LGTM, with a possible improved word choice.

[the-hercules]

@mukeshpanchal27 @joemcgill Awaiting Review, I have made the suggested Changes.

[the-hercules]

Hey @joemcgill , Could you please review this PR.