Fix React warnings/errors.

[zpao]

This fixes warnings/errors that React is outputting.

1. title was an object, so the same key was being set for all elements. There's no need to use JSX for that since you're rendering an <h3> anyway, so easy win.
2. <ul> isn't a valid DOM child of <p> so rendering engines actually move DOM nodes around to make it work, which can break React. Use a <div> instead (and remove extra React fragment wrapping).
3. Properly case some attributes on <iframe>s

[gufengzhou]

LGTM and thank you so much!