ticket:10660: add back removed comments to fix missing sample code in ICU4C API doc

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@35084 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10682: Fix clone, copy constructor, and assignment operator in RulesBasedNumberFormat.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@35085 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10682: Fix memory leak in trunk.

git-svn-id: http://source.icu-project.org/repos/icu/icu/trunk/source@35087 251d0590-4201-4cf1-90de-194747b24ca1