ticket:10887: Fix documentation in MeasureFormat.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35696 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10884: Initial API proposal.

git-svn-id: http://source.icu-project.org/repos/icu/icu@35697 251d0590-4201-4cf1-90de-194747b24ca1