[drupal-docs] Styleguide

[Charlie Lowe]

There's no instance where these should be used in this kind of 
documentation, so change to

"Do not use 1st person pronouns: I, my, we, our, etc."

Anisa wrote:
> Addition, as per: http://drupal.org/node/15595
> 
> Use 'your' not 'my' when refering to the user's drupal site. 
> 
> Anisa.
>