ticket:10445: fix a couple of links in the maint-52 readme

git-svn-id: http://source.icu-project.org/repos/icu/icu@34498 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10458: Create branch.

git-svn-id: http://source.icu-project.org/repos/icu/icu@34504 251d0590-4201-4cf1-90de-194747b24ca1
ticket:9101: going for broke: replace old RuleBasedCollator code with new implementation, turn ucol_ C API back into thin wrapper over C++; incomplete and does not currently work

git-svn-id: http://source.icu-project.org/repos/icu/icu@34505 251d0590-4201-4cf1-90de-194747b24ca1