Update debconf example (#33397)
Update debconf example (#33397)

'true' needs to be quoted as a string, otherwise it is stored as boolean and ends up getting capitalized to 'True' when presented to debconf
Subsequent install of oracle-java8-installer fails with "oracle-license-v1-1 license could not be presented"

ansible version: 2.3.1.0

Actual: value: true
    debconf-show oracle-java8-installer
    * shared/accepted-oracle-license-v1-1: True

Expected: value: 'true'
    debconf-show oracle-java8-installer
    * shared/accepted-oracle-license-v1-1: true
thaim/ansible,thaim/ansible