Adds note to templates
Adds note to templates

This closes #2986, although it was actually closed in perl6/Documentable#17. The problem there is that the variables were not being substituted, simply because no one thought they were actually used. Code to substitute them was added, and that was that.

perl6/doc,tbrowder/doc,perl6/doc,perl6/doc,tbrowder/doc,perl6/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc,perl6/doc,MasterDuke17/doc