[utils] Update find-rev utility to take a branch argument (name of the git-svn
branch).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172740 91177308-0d34-0410-b5e6-96231b3b80d8
[docs] Get rid of some UTF8 characters (non-breaking space maybe).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172741 91177308-0d34-0410-b5e6-96231b3b80d8