Minimize the width of the notes region: it will end where the text ends, if the

Minimize the width of the notes region: it will end where the text ends, if the
line of text is short enough, instead of stretching all the way to the right
margin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61481 91177308-0d34-0410-b5e6-96231b3b80d8