Manuals: Remove DESCRIPTION and KEYWORDS

* org.texi (Export settings)
  orgguide.texi (Export options): Remove DESCRIPTION and KEYWORDS.

doc/org.texi

@@ -10679,26 +10679,11 @@ A date or a time-stamp@footnote{The variable
 @code{org-export-date-timestamp-format} defines how this time-stamp will be
 exported.}.
 
-@item DESCRIPTION
-@cindex #+DESCRIPTION
-The document description.  Back-ends handle it as they see fit (e.g., for the
-XHTML meta tag), if at all.  The keyword is supported by @LaTeX{} back-ends,
-HTML back-ends, ASCII back-ends, the Texinfo back-end, and the ODT back-end.  You
-can use several such keywords for long descriptions.
-
 @item EMAIL
 @cindex #+EMAIL
 @vindex user-mail-address
 The email address (@code{user-mail-address}).
 
-@item KEYWORDS
-@cindex #+KEYWORDS
-The keywords defining the contents of the document.  Back-ends handle it as
-they see fit (e.g., for the XHTML meta tag), if at all.  The keyword is
-supported by @LaTeX{} back-ends, HTML back-ends, ASCII back-ends, the Texinfo
-back-end, and the ODT back-end.  You can use several such keywords if the list
-is long.
-
 @item LANGUAGE
 @cindex #+LANGUAGE
 @vindex org-export-default-language

doc/orgguide.texi

@@ -2350,8 +2350,6 @@ Insert template with export options, see example below.
 #+AUTHOR:      the author (default taken from @code{user-full-name})
 #+DATE:        a date, fixed, or an Org timestamp
 #+EMAIL:       his/her email address (default from @code{user-mail-address})
-#+DESCRIPTION: the page description, e.g.@: for the XHTML meta tag
-#+KEYWORDS:    the page keywords, e.g.@: for the XHTML meta tag
 #+LANGUAGE:    language, e.g.@: @samp{en} (@code{org-export-default-language})
 #+OPTIONS:     H:2 num:t toc:t \n:nil ::t |:t ^:t f:t tex:t ...
 @end smallexample