Fix translation key for "Regards" in email view

[mforstme]

This pull request includes a small change to the src/Illuminate/Notifications/resources/views/email.blade.php file. The change modifies the salutation format in the email template.

• Changed the salutation from @lang('Regards,')<br> to @lang('Regards'),<br>.

[taylorotwell]

I am closing this pull request because it lacks sufficient explanation, tests, or both. It is difficult for us to merge pull requests without these things because the change may introduce breaking changes to the framework.

Feel free to re-submit your change with a thorough explanation of the feature and tests - integration tests are preferred over unit tests. Please include it's benefit to end users; the reasons it does not break any existing features; how it makes building web applications easier, etc.

Thanks!

[mforstme]

The checks all run through and the fix is so trivial and clear that the commentary could not be more explicit.