[Release] Update release notes 23.3

[jaclync]

Description

Updates release notes and changelog for 23.3.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 23.3 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

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[iamgabrielma]

Suggested change

	Enjoy a smoother store management experience with clearer shipping labels for physical items, friendlier product code error messages, more reliable custom fields, and noticeably faster logins for WordPress.com users—all designed to streamline your daily workflow.
	Enjoy a smoother store management experience with clearer shipping labels for physical items, friendlier product code error messages, more reliable custom fields, and noticeably faster logins for WordPress.com users. All designed to streamline your daily workflow.

Nit: This em dash feels odd to me, maybe just a dot?

[jaclync]

Thanks for the suggestion, that makes sense (also consulted with Perplexity) and I made the suggested changes in aa27ed0.

[jaclync]

Thanks for the prompt review Gabriel! Merging now.

[itsmeichigo]

Sorry for missing this PR, but regarding this:

noticeably faster logins for WordPress.com users

I think this is misleading. The performance improvement is for most requests made for authenticated users. A better phrase would be "better app performance for users authenticated with WordPress.com".

I wonder if it's necessary/possible to change the copy before the content is translated.

[jaclync]

I think this is misleading. The performance improvement is for most requests made for authenticated users. A better phrase would be "better app performance for users authenticated with WordPress.com".

I wonder if it's necessary/possible to change the copy before the content is translated.

I see, I didn't have the full context of the change and missed it. I started a thread in Apps Infra to check if it's possible to update the string p1758501339104309-slack-CC7L49W13 - it didn't seem possible to edit the original string in GlotPress.