Language improvements, fix entity naming, make pipeline a graph and move
device usage documentation to device documentation ipu3.rst.
Signed-off-by: NYong Zhi <yong.zhi@intel.com>
Signed-off-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>