Improving docs, security simultaneously

[llvee]

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I opened an issue about this at the url below:
github/docs#34756

Improved the content below here.

What article on docs.github.com is affected?
https://github.com/github/docs/blob/main/content/account-and-profile/setting-up-and-managing-your-personal-account-on-github/

What part(s) of the article would you like to see updated?
The article mentions sending emails, falls short when it comes to sharing the exact template or message used to invite others. This is important for security as it's currently impossible to ascertain the exact information shared via the doc page, & using a second email for testing invites creates an unneccesary security risk since there is currently no way to test that locally.

Additional information
This affects anyone who uses the invitation docs to understand the feature better. Adding more information about exact emails sent can help prevent lots of unauthorised account accesses, data leaking.

Docs page should be updated to include the new collaboration template everytime it changes in order for users to accurately understand invite security risks.

Below is the email template for the current collaboration invite:

@[username] has invited you to collaborate on the
[username]/[repositoryname] repository
You can [accept or decline](https://github.com/repo/reponame/invitations?invitation_token=randomstringoftokennumbers&letters) this invitation. You can also visit @[username]([profile_url) to learn a bit more about them.

This invitation will expire in 7 days.

[View invitation]([invitation_url])
Note: This invitation was intended for matt@trashmail.de. If you were not expecting this invitation, you can ignore this email. If @[username] is sending you too many emails, you can [block them](https://github.com/settings/blocked_users?block_user=[username]) or [report abuse](https://github.com/contact/report-abuse?report=[username]).

Getting a 404 error? Make sure you’re signed in as [collaboration_invitee_email_address]

Button not working? Copy and paste this link into your browser:
[invitation_url]

[Manage your GitHub email preferences](https://github.com/settings/emails)

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