The List documentation was missing the material.io code markers. Many of the snippets did not render at all in Swift. This PR adds some, but not all. Improves #8293
List
Material Design Lists are continuous groups of text and/or images. The Material guidelines for Lists are extensive, and there is no class at this time for implementing any one of them, let alone all of them. However, we are starting to add classes that represent individual List Items. We currently offer two List Item Cells:
MDCBaseCell
The MDCBaseCell is a List Item at its simplest--a basic UICollectionViewCell subclass with Material Ink Ripple and Elevation. The MDCBaseCell provides a starting point to build anything the guidelines provide. To build a List using the MDCBaseCell simply treat it like you would any other UICollectionViewCell.
Below is an example:
MDCSelfSizingStereoCell
The MDCSelfSizingStereoCell is a subclass of MDCBaseCell. It exposes two image views (trailing and leading) and two labels (title and detail) that the user can configure however they like.
Below is an example:

