Update networking.markdown

On Fri, 13 Jun 2014, Volker Hilsheimer wrote:
> 
> In guide/introduction/networking.markdown:
> 
> > @@ -182,9 +182,9 @@ users must be added to the server configuration file.
> > 
> >  ## Encryption
> > 
> > -CFEngine provides encryption for keeping file contents private during transfer. It is assumed that users will use this judiciously. There is nothing to be gained by encrypting the transfer of public files – overt use of encryption just contributes to global warmin
> g, burning unnecessary CPU cycles without offering any security.
> > +CFEngine provides encryption for keeping file contents private during transfer. If `protocol_version` is set to "classic" or "1" then file transfers must be explicitly encrypted by setting ```encrypt=>"true"``` in a `copy_from` body of a `files` promise. For newer
>  protocol_version, all transfers are encrypted.
> 
> what's all the ``` all about? Single ticks for keywords, please. See the README file.

The triple-ticks are for code segments, not keywords. I erroneously 
triple-quoted cf-agent in one place. but the other places, like 
```encrypt=>"true"``` are better as triple backticks, since they will 
never be found as keywords. No?