The "full" blockchain has grown significantly due to 2016 DDoS attacks.
Without, e.g., `geth --fast`, it takes quite some drive space. Mention
the fact.

Someone reading the doc is likely to choose just one of the two
examples. Make "relevant" and "irrelevant" paragraphs consecutive.

These:

/home/veox/src/ethereum-alarm-clock/docs/changelog.rst:5: WARNING: Title underline too short.

/home/veox/src/ethereum-alarm-clock/docs/index.rst:35: WARNING: toctree contains reference to nonexisting document ':maxdepth: 1'

/home/veox/src/ethereum-alarm-clock/docs/request_factory.rst:6: WARNING: duplicate object description of RequestFactory, other instance in /home/veox/src/ethereum-alarm-clock/docs/architecture.rst, use :noindex: for one of them
/home/veox/src/ethereum-alarm-clock/docs/request_tracker.rst:6: WARNING: duplicate object description of RequestTracker, other instance in /home/veox/src/ethereum-alarm-clock/docs/architecture.rst, use :noindex: for one of them
/home/veox/src/ethereum-alarm-clock/docs/transaction_request.rst:7: WARNING: duplicate object description of TransactionRequest, other instance in /home/veox/src/ethereum-alarm-clock/docs/claiming.rst, use :noindex: for one of them