DocBook/drm: Clean up the paragraph on framebuffer objects

  <sect1>

    <title>Framebuffer management</title>

    <para>

      In order to set a mode on a given CRTC, encoder and connector

      configuration, clients need to provide a framebuffer object which

      provides a source of pixels for the CRTC to deliver to the encoder(s)

      and ultimately the connector(s) in the configuration.  A framebuffer

      is fundamentally a driver specific memory object, made into an opaque

      handle by the DRM addfb function.  Once an fb has been created this

      way it can be passed to the KMS mode setting routines for use in

      a configuration.

      Clients need to provide a framebuffer object which provides a source

      of pixels for a CRTC to deliver to the encoder(s) and ultimately the

      connector(s). A framebuffer is fundamentally a driver specific memory

      object, made into an opaque handle by the DRM's addfb() function.

      Once a framebuffer has been created this way, it may be passed to the

      KMS mode setting routines for use in a completed configuration.

    </para>

  </sect1>