guide: use _sample configurations..._ rather than _here_ as link text

It depends per project. We prefer replace. Just git commit --amend and force push, and it will update the PR

Sent from my iPhone

> On Sep 13, 2014, at 15:30, Dan Connolly <notifications@github.com> wrote:
> 
> In src/doc/guide.md:
> 
> > @@ -185,8 +185,7 @@ Next up is this line:
> >  This line does all of the work in our little program. There are a number of
> >  details that are important here. The first is that it's indented with four
> >  spaces, not tabs. Please configure your editor of choice to insert four spaces
> > -with the tab key. We provide some sample configurations for various editors
> > -[here](https://github.com/rust-lang/rust/tree/master/src/etc).
> > +with the tab key. We provide some [sample configurations for various editors](https://github.com/rust-lang/rust/tree/master/src/etc).
> Should I make a 2nd commit or replace this one?
> 
> I'm new to this PR game.
> 
> \
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