Add some comments and documentation to hll-grammar.pir .
Add some comments and documentation to hll-grammar.pir .

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,perl6/nqp-rx,perl6/nqp-rx,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp