LI xEntries in a UL list should be of type LI, but conversion to type LI is done automatically for the user.
The object LI is a markup type, with ancestor classes HypertextContainer < Hypertext < BasicList < Thing.
The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/Text.m2:451:0.