Tweak comments.

Signed-off-by: enyst <engel.nyst@gmail.com>
Replace mods with addons.

Signed-off-by: enyst <engel.nyst@gmail.com>
Remove unused index from $context.

Signed-off-by: enyst <engel.nyst@gmail.com>
Variables $mod replaced with $addon, modification and package

Signed-off-by: enyst <engel.nyst@gmail.com>
Merge pull request #782 from engelnyst/misc_doc

Documentation replaced