Boost: Update the short description

[kraftbj]

Fixes HOG-73

Proposed changes:

• Update the short description to provide more information about the functionality of Boost.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

See HOG-73
Product p2 post: pgo0CM-og-p2

Does this pull request change what data or activity we track or use?

No.

Testing instructions:

• None, copy edit only.

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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• ✅ Add a "[Status]" label (In Progress, Needs Review, ...).
  
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• ✅ Add testing instructions.
  
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• ✅ Add changelog entries to affected projects
  

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Boost plugin:

No scheduled milestone found for this plugin.

If you have any questions about the release process, please ask in the #jetpack-releases channel on Slack.

[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

Full summary · PHP report · JS report

[kraftbj]

Taking the review on p2 as the review for this. Merging!