Fix grammatical mistake in RFD 21
Fix grammatical mistake in RFD 21

joyent/rfd,rmustacc/rfd,davepacheco/rfd,melloc/rfd,melloc/rfd,joyent/rfd,melloc/rfd,joyent/rfd,AnthonyMann/rfd,AnthonyMann/rfd,joyent/rfd,davepacheco/rfd,davepacheco/rfd,davepacheco/rfd,rmustacc/rfd,davepacheco/rfd