Added comment syntax on 101 page.
Added comment syntax on 101 page.

I think it's handy to make that easier to find in the
documentation.

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