[MacPorts] #31568: UPDATE: caml-graph 1.8

[MacPorts]

#31568: UPDATE: caml-graph 1.8
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 Reporter:  mww@…             |       Owner:  fh@…          
     Type:  update            |      Status:  new           
 Priority:  Normal            |   Milestone:  MacPorts 2.0.4
Component:  ports             |     Version:  2.0.3         
 Keywords:                    |        Port:  caml-graph    
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 update ocamlgraph to v1.8; add documentation;

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Ticket URL: <https://trac.macports.org/ticket/31568>
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