DocBook: Add a help message for DOCBOOKS env var
Sometimes, it is needed to compile only a subset of the possible DocBooks. This is supported by the building system, but it is not docummented. Add a documentation for it. Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com> Signed-off-by: NJonathan Corbet <corbet@lwn.net>
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