Document Update Instructions have been revised

[John Ralls]

> On Jan 25, 2017, at 11:55 PM, David T. <sunfish62 at yahoo.com> wrote:
> 
> 
> 
> 
> On Thu, Jan 26, 2017 at 8:26, John Ralls
> <jralls at ceridwen.us> wrote:
> 
> Indeed. But you don't need all of it, just the command-line tools.
> 
> Regards,
> John Ralls
> 
> 
> 
> I'm not sure you can get one without first getting the other. At least, I haven't been able to. 
Assuming that you don't already have Xcode installed, try running 
  clang foo.cpp
in Terminal. That should pop up a dialog box offering to install them for you.

Regards,
John Ralls