Uibuilder documentation suggestions and improvements

I realise that the Documentation (6.1.0) is 'early days', and these comments are supposed to be constructive from a 'newbie' point of view.

A couple/three of questions (using 6.1.0 version - using links in Github 6.1.0 Readme.md)

Will the 'First Timers walkthrough' documents be the same for 6.1, if so, I have no clue where this is,
You will also see a property called cacheControl with a value of "REPLAY". This can be wired back to the uibuilder input and used to send cached data when a new client connects (or an existing client reloads the page). Does that apply to 6.0 only?
(You also have Walkthough instead of Walkthrough)

Using the Example flows you gave, I have loaded into NR and am stuck on the Change the URL to match the base.

I am completely confused regarding the 'Parent' box for the uib-element node I have done HTML and CSS in the past, but I am not sure if it is my limited knowledge or the instructions baffling me.