Re: [webcomponents] Upstream Shadow DOM spec to DOM/HTML Standard (#377)

If we agree that we use "in a composed document", let me do a batch internal renaming refactoring in the Shadow DOM spec as follows:

- *a composed document*: The new term, which is equivalent of "Tree of trees whose root tree is a document tree"
- *in a composed document": This is exactly equivalent to *In a document deeply"
- *deep XXX* -> Renamed to *composed XXX*
- *composed XXX*-> Renamed to *flattened XXX*

This internal renaming does not affect any web-facing APIs. 


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https://github.com/w3c/webcomponents/issues/377#issuecomment-180201536