libata: minor DocBook update

<toc></toc>

  <chapter id="libataIntroduction">

     <title>Introduction</title>

  <para>

  libATA is a library used inside the Linux kernel to support ATA host

  controllers and devices.  libATA provides an ATA driver API, class

  transports for ATA and ATAPI devices, and SCSI<->ATA translation

  for ATA devices according to the T10 SAT specification.

  </para>

  <para>

  This Guide documents the libATA driver API, library functions, library

  internals, and a couple sample ATA low-level drivers.

  </para>

  </chapter>

  <chapter id="libataThanks">

     <title>Thanks</title>

  <para>

  The bulk of the ATA knowledge comes thanks to long conversations with

  Andre Hedrick (www.linux-ide.org).

  Andre Hedrick (www.linux-ide.org), and long hours pondering the ATA

  and SCSI specifications.

  </para>

  <para>

  Thanks to Alan Cox for pointing out similarities