EOP-198: clarify that Momentum resolv.conf does not support nameserver rotation

[juliebin]

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[dkoerichbird]

LGTM

[kkelley1]

Should this be "upstream nameserver"?

[juliebin]

"server" should be good enough here. Change it to nameserver makes two "nameserver"s (i.e. An upstream nameserver supporting nameserver rotation) show up almost back to back.