Example for Documentation?

[Chris via Digitalmars-d]

On Tuesday, 21 April 2015 at 18:10:25 UTC, Steven Schveighoffer 
wrote:
> On 4/21/15 2:06 PM, Chris wrote:
>
>> multiSort should at least be added to the cheat sheet in
>> std.algorithm.sorting.
>
> This I can agree with. Can you add a pull request for it?
>
> -Steve

Yeah, but I have to ask a stupid question. How do I add a PR? 
I've never done it before.