Corrected IPv6 Address Configuration Mode tooltip

Corrected this tooltip to reflect the actual name of the option:
'No options specified' instead of the incorrect: 'No option selected'.
Also made minor adjustments for grammar.

Change-Id: I0f89390cf0dbfdd3775fc9985b2dd77512593ac8
Closes-Bug: 1394581
Merge "Corrected IPv6 Address Configuration Mode tooltip"