docs: Document required name for expose=true check

[krishicks]

I followed #7709 when trying to reproduce this. I wasn't able to confirm that name needs to be set on both service and check; it appeared only to be required on check (as the service gets a name by default).

[holtwilkins]

Hey @shoenig & @krishicks , is this actually correct? I just tested (with Nomad 1.0.2) an http check on a connect-enabled service, and set expose to true on the check but left name blank. It looks like I get a name like this by default "service: \"<The service's name here>\" check"

Note also in this case that I'm setting the service name explicitly, and not using the default one.

[krishicks]

It possibly comes down to default name collision avoidance: if you set the service name, you don't need to set the check name, but if you don't set the service name, you do need to set the check name. 😞

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