org.texi: Changes to In-buffer settings

* org.texi (In-buffer settings): Remove keywords not defined in ox.el

doc/org.texi

@@ -17134,10 +17134,6 @@ multiple #+TBLFM lines} in @ref{Editing and debugging formulas}.
 
 @item #+TITLE:, #+AUTHOR:, #+EMAIL:, #+LANGUAGE:, #+DATE:,
 @itemx #+OPTIONS:, #+BIND:,
-@itemx #+DESCRIPTION:, #+KEYWORDS:,
-@itemx #+LATEX_HEADER:, #+LATEX_HEADER_EXTRA:,
-@itemx #+HTML_HEAD:, #+HTML_HEAD_EXTRA:, #+HTML_LINK_UP:, #+HTML_LINK_HOME:,
-@itemx #+ODT_STYLES_FILE:,
 @itemx #+SELECT_TAGS:, #+EXCLUDE_TAGS:
 These lines provide settings for exporting files.  For more details see
 @ref{Export settings}.