* doc/orgguide.texi (Comment lines): A whitespace is mandatory after
the "#" sign.
(Export options): Along with plain text, DATE expects an Org
timestamp, not a format string. Also fix OPTIONS items and remove
back-end specific keywords.
(The export dispatcher): An active region is not sufficient to trigger
subtree export.
(DocBook export): Remove section.
(ASCII/Latin-1/UTF-8 export, HTML export, @LaTeX{} and PDF export,
Publishing): Update keybindings.
(iCalendar export): Update keybindings and fix variable name.
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