Add clang::DesignatedInitExpr::designators() for range-based access,
with overloads for designators_range and designators_const_range.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213500 91177308-0d34-0410-b5e6-96231b3b80d8
Trivial doc fixes: add missing whitespace, and s/overriden/overridden/g.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213502 91177308-0d34-0410-b5e6-96231b3b80d8