Let's document lv_layout and lv_role fields more - they are quite useful in identifying various LV types and layouts and it's also useful for selection. Simply we need to document various values these two fields may report so users know what they can expect, expecially when using these two fields for selections (-S|--select). Also add a note about a possibility to look for subsets of values from the lists (both lv_layout and lv_role are fields of string list type).
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle. Changing version to '24'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora24#Rawhide_Rebase