doc-rst: libv4l-introduction: improve format

Fix some cross-references and improve the layout of this
page.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/linux_tv/media/v4l/libv4l-introduction.rst

@@ -45,7 +45,7 @@ It currently accepts the following V4L2 driver formats:
 :ref:`V4L2_PIX_FMT_SPCA508 <V4L2-PIX-FMT-SPCA508>`,
 :ref:`V4L2_PIX_FMT_SPCA561 <V4L2-PIX-FMT-SPCA561>`,
 :ref:`V4L2_PIX_FMT_SQ905C <V4L2-PIX-FMT-SQ905C>`,
-``V4L2_PIX_FMT_SRGGB8``,
+:ref:`V4L2_PIX_FMT_SRGGB8 <V4L2-PIX-FMT-SRGGB8>`,
 :ref:`V4L2_PIX_FMT_UYVY <V4L2-PIX-FMT-UYVY>`,
 :ref:`V4L2_PIX_FMT_YUV420 <V4L2-PIX-FMT-YUV420>`,
 :ref:`V4L2_PIX_FMT_YUYV <V4L2-PIX-FMT-YUYV>`,
@@ -92,16 +92,16 @@ and to enhance the image quality.
 In most cases, libv4l2 just passes the calls directly through to the
 v4l2 driver, intercepting the calls to
 :ref:`VIDIOC_TRY_FMT <VIDIOC_G_FMT>`,
-:ref:`VIDIOC_G_FMT <VIDIOC_G_FMT>`
-:ref:`VIDIOC_S_FMT <VIDIOC_G_FMT>`
-:ref:`VIDIOC_ENUM_FRAMESIZES` and
-:ref:`VIDIOC_ENUM_FRAMEINTERVALS` in
+:ref:`VIDIOC_G_FMT <VIDIOC_G_FMT>`,
+:ref:`VIDIOC_S_FMT <VIDIOC_G_FMT>`,
+:ref:`VIDIOC_ENUM_FRAMESIZES <VIDIOC_ENUM_FRAMESIZES>` and
+:ref:`VIDIOC_ENUM_FRAMEINTERVALS <VIDIOC_ENUM_FRAMEINTERVALS>` in
 order to emulate the formats
 :ref:`V4L2_PIX_FMT_BGR24 <V4L2-PIX-FMT-BGR24>`,
 :ref:`V4L2_PIX_FMT_RGB24 <V4L2-PIX-FMT-RGB24>`,
 :ref:`V4L2_PIX_FMT_YUV420 <V4L2-PIX-FMT-YUV420>`, and
 :ref:`V4L2_PIX_FMT_YVU420 <V4L2-PIX-FMT-YVU420>`, if they aren't
-available in the driver. :ref:`VIDIOC_ENUM_FMT`
+available in the driver. :ref:`VIDIOC_ENUM_FMT <VIDIOC_ENUM_FMT>`
 keeps enumerating the hardware supported formats, plus the emulated
 formats offered by libv4l at the end.