[PECOFF] Fix comment.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@186346 91177308-0d34-0410-b5e6-96231b3b80d8
[PECOFF][Writer] Refactoring: Move private methods below public ones.

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@186352 91177308-0d34-0410-b5e6-96231b3b80d8