Update 10.4-test-utils.md (#6971)
Update 10.4-test-utils.md (#6971)

The find/scry methods which returns DOM component in react@0.13 now returns DOMElement in react@0.14 and later.
(cherry picked from commit a394ed6a6c67768e04f957d29c9767da4e9d3278)

with-git/react,with-git/react,with-git/react,with-git/react,with-git/react,with-git/react,with-git/react