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Update description for opam-graph

Opam-graph makes strong assumptions on the opam switch export output so
we should be more explicit in the example in its opam package
description.

Changed files
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packages
opam-graph
opam-graph.0.1.1
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packages/opam-graph/opam-graph.0.1.1/opam
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synopsis: "Graphing dependencies of opam packages"
description: """\
This package outputs dependency graphs (in svg and dot) of opam package
-
universes (opam switch export)."""
maintainer: "Robur <team@robur.coop>"
authors: "Robur <team@robur.coop>"
license: "ISC"
···
synopsis: "Graphing dependencies of opam packages"
description: """\
This package outputs dependency graphs (in svg and dot) of opam package
+
universes (opam switch export --full --freeze)."""
maintainer: "Robur <team@robur.coop>"
authors: "Robur <team@robur.coop>"
license: "ISC"