Support params routes on documentation section

[weierophinney]

I'm using child routes with success in apigility, but the zfcampus/zf-apigility-documentation and zfcampus/zf-apigility-admin-ui packages apparently don't support the child routes.
I got this Notice on Documentation section:
Notice: Undefined index: my.route/is-child in ./vendor/zfcampus/zf-apigility-documentation/src/ApiFactory.php on line 190

I'm trying to make a fix about that but I need to know why route params have been suppress on zfcampus/zf-apigility-admin-ui on this line. Maybe @ezimuel can help me ?

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Originally posted by @lucascampelo at zfcampus/zf-apigility-admin-ui#134