Summary
    Sets the key to use in the heading documents to store the children
    of a given heading. In other words, the metadata for this key will
    contain all the headings following the one in the document with a
    level one deeper than the current heading.
    
		- Assembly
 - Wyam
.Html .dll  - Namespace
 - Wyam
.Html  - Containing Type
 - Headings
 
Syntax
public Headings WithChildrenKey(string childrenKey)
	Parameters
| Name | Type | Description | 
|---|---|---|
| childrenKey | string | The key to use for children. | 
Return Value
| Type | Description | 
|---|---|
| Headings | The current module instance. | 
