Add documentation for the SBTarget::ReadInstructions and SBTarget::GetInstructions APIs so it's a little clearer to  understand which should be used.
Add documentation for the SBTarget::ReadInstructions and
SBTarget::GetInstructions APIs so it's a little clearer to 
understand which should be used.

<rdar://problem/18787018>


git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@222225 91177308-0d34-0410-b5e6-96231b3b80d8

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