Fix use of `\pdfinfo` (refs #3551, #3567)

Although the data in ``\pdfinfo`` as set-up in ``sphinxmanual.cls`` was
ignored, some LaTeX commands (e.g. ``\large``) in the ``latex_documents``
title item could cause failed PDF builds.

This commit removes the anyhow ignored ``\pdfinfo`` usage, and indicates
in commented-out lines how to use ``\hypersetup``, which may be done in
master branch, or possibly in stable branch, if some consensus emerges
about how to represent ``\and`` in the ``/Author`` field. It seems the
PDF Document Information Dictionary does not seem to provide any
universal multi-lingual way to indicate multiple authors.

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