org.texi: Fix reference to an unknown variable

* doc/org.texi (Literal examples): Remove reference to unknown
  `org-export-latex-minted' variable. Also simplify footnote since
  `org-export-latex-listings' documentation is exhaustive already.

doc/org.texi

@@ -9253,23 +9253,14 @@ look like the fontified Emacs buffer@footnote{This works automatically for
 the HTML backend (it requires version 1.34 of the @file{htmlize.el} package,
 which is distributed with Org).  Fontified code chunks in @LaTeX{} can be
 achieved using either the listings or the
-@url{http://code.google.com/p/minted, minted,} package.  To use listings, turn
-on the variable @code{org-export-latex-listings} and ensure that the listings
-package is included by the @LaTeX{} header (e.g.@: by configuring
-@code{org-export-latex-packages-alist}).  See the listings documentation for
-configuration options, including obtaining colored output.  For minted it is
-necessary to install the program @url{http://pygments.org, pygments}, in
-addition to setting @code{org-export-latex-minted}, ensuring that the minted
-package is included by the @LaTeX{} header, and ensuring that the
-@code{-shell-escape} option is passed to @file{pdflatex} (see
-@code{org-latex-to-pdf-process}).  See the documentation of the variables
-@code{org-export-latex-listings} and @code{org-export-latex-minted} for
-further details.}.  This is done with the @samp{src} block, where you also
-need to specify the name of the major mode that should be used to fontify the
-example@footnote{Code in @samp{src} blocks may also be evaluated either
-interactively or on export.  See @pxref{Working With Source Code} for more
-information on evaluating code blocks.}, see @ref{Easy Templates} for
-shortcuts to easily insert code blocks.
+@url{http://code.google.com/p/minted, minted,} package.  Refer to
+@code{org-export-latex-listings} documentation for details.}.  This is done
+with the @samp{src} block, where you also need to specify the name of the
+major mode that should be used to fontify the example@footnote{Code in
+@samp{src} blocks may also be evaluated either interactively or on export.
+See @pxref{Working With Source Code} for more information on evaluating code
+blocks.}, see @ref{Easy Templates} for shortcuts to easily insert code
+blocks.
 @cindex #+BEGIN_SRC
 
 @example