support Varnish in configuration blocks
minor #4287 support Varnish in configuration blocks (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
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support Varnish in configuration blocks

To be able to use them, fabpot/sphinx-php#20 has to be merged first. After that, the submodule reference has to be updated as well with this pull request.

@dbu @thierrymarianne Is Ruby the language to choose to get proper syntax highlighting?

Commits
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f2bf980 support Varnish in configuration blocks