fix typo in description of helo_name

[Flottegurke]

I corrected a small typo.
(This is my first PR - I hope I did everything correctly)

[tessus]

Everything seems fine, except the title. The title suggests you replaced is on with the, which you didn't. You just removed is on. You also have a typo in the title. ;-)

I'd change the title to: fix(config): correct typo in template

P.S.: No need to change the commit message. The PRs are squashed anyway, so the title becomes the commit message.

[Flottegurke]

OK, thanks!

[stefan0xC]

vaultwarden/src/config.rs

Lines 779 to 780 in 77008a9

	/// Server name sent during HELO |> By default this value should be is on the machine's hostname, but might need to be changed in case it trips some anti-spam filters
	helo_name: String, true, option;

should also be corrected. And I would change the title of the commit to "fix typo in description of helo_name" or something like that.

[Flottegurke]

Oh, I missed that. I think I've fixed it now.

[dani-garcia]

lgtm thanks!