-Valid gutter-visible instantiators are t, nil or a list of symbols. If
-a gutter-visible instantiator is set to a list of symbols, and the
-corresponding gutter specification is a property-list strings, then
-elements of the gutter specification will only be visible if the
+Valid gutter-visible instantiators are @code{t}, @code{nil} or a list of
+symbols. If a gutter-visible instantiator is set to a list of symbols,
+and the corresponding gutter specification is a property-list strings,
+then elements of the gutter specification will only be visible if the