fix compilation error

Author: coke

doc/Language/glossary.pod6

@@ -33,6 +33,7 @@ Generically, an adverb is a named argument to a function.  There are
 also some specific syntax forms that allow adverbs to be tucked into
 some convenient places:
 
+=for code :preamble<my @h>
     q:w"foo bar";   # ":w" is a Quotelike form modifier adverb
     m:g/a|b|c/;     # ":g" is also
     @h{3}:exists;   # ":exists" is also, but is known as a subscript adverb