Update validation error message for TXT record

[gius80]

Changes proposed in this Pull Request

• This PR update the validation error message when a user try to create a TXT record longer than 255 characters: it adds a link to support page to better explain TXT record's limitations.

Testing instructions

• Try add a new TXT DNS record longer than 255 characters for a domain managed by WordPress.com (Calypso url: /domains/manage/[YOU-DOMAIN]/add-dns-record/[YOU-DOMAIN])

Related to #56326

[matticbot]

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

App Entrypoints (~47 bytes added 📈 [gzipped])

name                   parsed_size           gzip_size
entry-main                   +67 B  (+0.0%)      +21 B  (+0.0%)
entry-domains-landing        +67 B  (+0.0%)      +24 B  (+0.0%)

Common code that is always downloaded and parsed every time the app is loaded, no matter which route is used.

Sections (~20 bytes added 📈 [gzipped])

name     parsed_size           gzip_size
domains       +122 B  (+0.0%)      +20 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.

[github-actions]

Link to Calypso live: https://calypso.live?image=registry.a8c.com/calypso/app:build-20130
Link to Jetpack Cloud live: https://calypso.live?image=registry.a8c.com/calypso/app:build-20130&env=jetpack

[hambai]

Awesome - looks great!

[a8ci18n]

This Pull Request is now available for translation here: https://translate.wordpress.com/deliverables/6995885

Thank you @gius80 for including a screenshot in the description! This is really helpful for our translators.

[a8ci18n]

Translation for this Pull Request has now been finished.