RN: Add section for PACKAGEGROUPS and images

The files packagegroups.inc and images.inc are not included
on purpose. Those files are automatically generated by the
updated script.

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
RN: Fix title underline length

This avoid a warning

   WARNING: Title underline too short.

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
script: Add gstreamer1.0

This user space package is important to be tracked.

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
RN: Updates from bitbake-metadata2doc.sh

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
RN: Updates from script only on ack-sourcers file

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>