Update wording for domain subscription description in purchases page

[daledupreez]

Proposed Changes

• This PR implements the wording changes from https://github.com/Automattic/wp-calypso/issues/63891, specifically in this comment

Testing Instructions

• For a site where you have a domain registration or domain mapping, navigate to Upgrades -> Purchases
• Click on a row for a domain registration or domain mapping
• Verify that the description for the subscription uses the following language:

When used with a paid plan, your custom domain can replace your site's free address, [wordpress.com_url], with [custom_domain], making it easier to remember and easier to share.

Screenshot

Pre-merge Checklist

• [ ] Have you written new tests for your changes?
• [ ] Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• [x] Have you checked for TypeScript, React or other console errors?
• [ ] Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• [ ] Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • I will add the string freeze label once we confirm the wording

Related to #63891

[github-actions[bot]]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-ca17cf71a7b3fc46865c76747c5c9ff70465ace2

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-ca17cf71a7b3fc46865c76747c5c9ff70465ace2&env=jetpack

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~64 bytes added 📈 [gzipped])

name            parsed_size           gzip_size
site-purchases       +155 B  (+0.0%)      +64 B  (+0.0%)
purchases            +155 B  (+0.0%)      +64 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

Parsed Size: Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory. Gzip Size: Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[wensco]

The copy change looks good to me!

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/7464772

Thank you @daledupreez for including a screenshot in the description! This is really helpful for our translators.

[a8ci18n]

Translation for this Pull Request has now been finished.

[mpkelly]

I have deployed this already, @daledupreez.