Improve mesage on failed Graphviz optional (backport #11896) #12071
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Summary
I have recently seen several users struggle to install a complete version of Graphviz upon seeing the
MissingOptionalLibraryError
message. This updates the message to make it clearer that the PyPI distributiongraphviz
is not the actual Graphviz software, and it must be installed separately.Details and comments
Fix #11865, also a couple more messages I've seen on the public Qiskit slack.
This is an automatic backport of pull request #11896 done by [Mergify](https://mergify.com).