Fix example in docs to use data from structure to render.
Fix example in docs to use data from structure to render.

ihrwein/handlebars-rust,tailhook/handlebars-rust,sunng87/handlebars-rust,sunng87/handlebars-rust,wang19742008/handlebars-rust,tempbottle/handlebars-rust,tempbottle/handlebars-rust,tailhook/handlebars-rust