Dynamic example in formatting guidelines

Interwiki's formatting guidelines provide this hardcoded example:

e.g., "[w:public transport|public transportation]" displays as "public transportation."

But if the default prefix "w" has been deleted, this example is confusingly misleading for a user. Although clicking through to the interwiki help page will clarify the matter somewhat, it would be helpful to have the guidelines refer to a prefix that the module is actually configured to use at that site.