16001 printing bitfields with %b can't print bit 31
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Andy Fiddaman <illumos@fiddaman.net>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>

7682 document sprintf(9F) family
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Richard Lowe <richlowe@richlowe.net>