updated grammar syntax doc and put in example
updated grammar syntax doc and put in example

blaze/datashape,aterrel/datashape,cowlicks/datashape,quantopian/datashape,ContinuumIO/datashape,llllllllll/datashape,cpcloud/datashape,ContinuumIO/datashape,llllllllll/datashape,aterrel/datashape,cowlicks/datashape,blaze/datashape,cpcloud/datashape,quantopian/datashape