[w3c/webcomponents] Link to example from early in spec (#656)

Consider linking to the example in section 8 from various relevant places in the spec, eg in the definition of "slotable" (in the note in 2.2 which currently links to itself). I spent an hour trying to understand how to associate a light DOM node with its shadow DOM slot before I chanced upon the example at the bottom! Or - better still - give an example at the top of 2.2:

In light DOM, an element with a slot attribute of "<ident>" is inserted into Shadow DOM in a slot element with name="<ident>"

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