[Docs] Differentiate between public and private API
[Docs] Differentiate between public and private API

On the homepage we should have a clear distinction between the public
and private C++ APIs.

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@360638 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb