Use consistent headless service name in example

[lowkeyliesmyth]

Fix a typo and update the headless service name to be consistent.

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[lowkeyliesmyth]

Signed the CLA

[miry]

@lowkeyliesmyth can you fix one more case (at least I found) with same typo in tutorial: https://github.com/kubernetes-sigs/external-dns/blame/master/docs/tutorials/hostport.md#L84

[lowkeyliesmyth]

@miry Thank you for pointing that out. I took care of the other "exeternal" typo instances, and after a cursory glance didn't find any others.

[lowkeyliesmyth]

/assign @njuettner

[lowkeyliesmyth]

@miry It looks like merging is blocked by a lack of "lgtm" or "mergeable" labels and I'm not sure who should provide either of those.

[miry]

@njuettner @hjacobs can you check pr?

[njuettner]

Thank you 🙂

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lowkeyliesmyth, njuettner

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