Patch #1025795: clarify language in Data Structures chapter of tutorial:

- Dictionary keys are in arbitrary order, but not random (which implies, well,
  intentional randomness).
- Move a footnote closer to what it's talking about so that it doesn't look
  like we're saying that "0 == 0.0" can't be relied on.
- Minor language tweaks in the vicinity.

Thanks Dima Dorfman!
1 file changed