[dom] Less ambiguous step description for Node.before (#47)

Before:

If viablePreviousSibling is non-null, set it to viablePreviousSibling’s
next sibling, and to parent’s first child otherwise.

After:

If viablePreviousSibling is non-null, set node to viablePreviousSibling’s
next sibling. Otherwise, set node to parent’s first child.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/47

-- Commit Summary --

  * Less ambiguous step description for Node.before

-- File Changes --

    M dom.html (6)

-- Patch Links --

https://github.com/whatwg/dom/pull/47.patch
https://github.com/whatwg/dom/pull/47.diff

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https://github.com/whatwg/dom/pull/47