[whatwg/dom] Clarify insert-node's record's previousSibling (#464)

This adds a previousSibling variable to the insert node algorithm in order to clarify that the previousSibling property of the mutation record generated by the insert node algorithm should be determined before inserting nodes. 

If implemented as described in the original text, the property would be determined after insertion, and will therefore always be the last of nodes.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/464

-- Commit Summary --

  * Clarify insert-node's record's previousSibling

-- File Changes --

    M dom.bs (7)

-- Patch Links --

https://github.com/whatwg/dom/pull/464.patch
https://github.com/whatwg/dom/pull/464.diff

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