ticket:10952: ScientificFormatter -> ScientificNumberFormatter

git-svn-id: http://source.icu-project.org/repos/icu/icu@36695 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10952: Fix documentation.

git-svn-id: http://source.icu-project.org/repos/icu/icu@36697 251d0590-4201-4cf1-90de-194747b24ca1