Format Description for RECVOPTS

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                                   (1)                  
>>-RECVopts-+-'type'-------------+------+-----------+----------->
            |   .-,----------.   |      '-,COUNT=nn-'   
            |   V            |   |                      
            '-(---+-type---+-+-)-'                      
                  '-'type'-'                            

>--+----------------+------------------------------------------><
   '-,INTERVAL=nnnn-'   

Notes:
  1. Omit the comma between initialization statement and first keyword