How to export / feature the "picture guidelines" field I have some legal mentions to put under the file upload form of user account.

I would like to put them a feature some elements about user configuration, but I'm not able to find which variable (i.e. Strongarm or anything else) is mapped to field "Picture guidelines" 
(available in Home » Administration » Configuration » People).

Could someone give me a hint, or is it even possible ?
Use Strongarm to export the variable called user_picture_guidelines.