Add docs to parsers category examples

Author: paultcochrane

categories/parsers/CSSGrammar.pm

@@ -1,7 +1,16 @@
-# This should be doing CSS2.1; hopefully CSS3 when that's ready (but that may be a while)
-
 use v6;
 
+=begin pod
+
+=TITLE CSS2.1 Grammar
+
+=AUTHOR David Warring
+
+This should be doing CSS2.1; hopefully CSS3 when that's ready (but that may
+be a while).
+
+=end pod
+
 grammar CSSGrammar {
         # builtin: ident (we use cssident), alpha
 

categories/parsers/Newick.pm

@@ -1,6 +1,15 @@
 use v6;
 
-#| Newick tree format. L<https://en.wikipedia.org/wiki/Newick_format>
+=begin pod
+
+=TITLE Newick tree format
+
+=AUTHOR Lucien Grondin
+
+See L<https://en.wikipedia.org/wiki/Newick_format>.
+
+=end pod
+
 grammar Newick {
     rule TOP { '(' <subtree>** 2..3 % \, ');' }
     rule subtree { <species> | '(' <subtree>** 2 % \, ')' }