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Re-order implementations to put true descendant first and full implementations before man-page only.
It's key that Bell Labs created troff, not the much larger AT&T.
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'''troff''' ({{IPAc-en|ˈ|t|iː|r|ɒ|f}}), short for "typesetter roff", is the major component of a [[document processing system]] developed by [[AT&TBell CorporationLabs]] for the [[Unix]] operating system. troff and the related [[nroff]] were both developed from the original [[roff (computer program)|roff]].
 
While nroff was intended to produce output on terminals and line printers, troff was intended to produce output on [[typesetting]] systems, specifically the [[CAT (phototypesetter)|Graphic Systems CAT]] that had been introduced in 1972. Both used the same underlying [[markup language]] and a single source file could normally be used by nroff or troff without change.