Fixes #25 - added warning to documentation

[fumblehool]

• Fixes Document that you can't rely on React 16 SSR patching up differences #25

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[bvaughn]

Maybe @sebmarkbage (or someone else that has more context on SSR+hydration) can review this PR to make sure it's sufficient.

[dustinsoftware]

Thanks! This warning is what I had in mind :)

[bvaughn]

Seems reasonable then. I'll merge it and Seb can always tweak it in a follow up. 😄

[sebmarkbage]

It's a bit confusing wording because the missing nodes won't get the wrong attributes, it's the other nodes that might get the wrong attributes if one sibling is missing.

[bvaughn]

Thanks for weighing in @sebmarkbage. Would this be an improvement?

However, it's dangerous to have missing nodes on the server render as this might cause sibling nodes to be created with incorrect attributes.

[sebmarkbage]

Sounds good

[bvaughn]

Cool beans. Changed in 8acec80. Thanks again!