Blast, Mantle, and ZKsync - open beta message.

[bgravenorst]

Description

Update the description of the Blast API service to be public beta

Preview

Checklist

Complete this checklist before merging your PR:

• [ ] If this PR contains a major change to the documentation content, I have added an entry to the top of the "What's new?" page.
• [ ] The proposed changes have been reviewed and approved by a member of the documentation team.

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Name	Status	Preview	Comments	Updated (UTC)
metamask-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 4, 2024 8:34pm

[joaniefromtheblock]

Added commits applying changes from this issue / Slack