docs: Document token category prefixes in Email builder

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Documents the improved token dropdown organization in the Email builder's text editor. Tokens are now grouped by category (Contact, Company, Owner, Page, DWC, Focus, Asset, Email) with descriptive prefixes for easier discovery.

Trigger Events

• mautic/mautic PR #15855: Entity token labels in CKEditor

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Added "Inserting tokens" section documenting the new token category prefixes introduced in PR #15855. The PR refactored TokenPlugin.js and added TokenSorter.php to group tokens by category (Contact, Company, Owner, Page, DWC, Focus, Asset, Email) with descriptive prefixes in the CKEditor dropdown.

Source: mautic/mautic#15855

[adiati98]

@promptless-for-oss please rebase to 7.2 branch.

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@adiati98 Done — rebased onto 7.2 and retargeted this PR's base branch accordingly.

The 7.2 branch had substantially rewritten the Tokens section (new "Tokenized From addresses" and "Sender resolution hierarchy" subsections), so the branch was rebuilt on top of 7.2 with only the intended content re-applied: the new "Inserting tokens" section now follows the "Sender resolution hierarchy" content in docs/channels/emails.rst. The net diff against 7.2 is the intended change. Example token labels were also switched from straight quotes to RST inline code (e.g. Contact: First Name) to satisfy Vale. The PR is now mergeable against 7.2.