Missing docs for autocomplete _renderItemData

[dcherman]

The documentation for the _renderMenu extension point references a _renderItemData method, however there is no documentation on what that does and how it differs from _renderItem.

Is _renderItemData missing documentation, or should _renderMenu be referring instead to the _renderItem extension point?

[scottgonzalez]

_renderItemData() is not an extension point, it performs the non-optional parts of rendering the items.