Add noreply warning to getting_started doc (#241)
Add noreply warning to getting_started doc (#241)

resolves #239

Add a warning to the Best Practices section of the Getting Started
doc which explains the interaction between `noreply=True` and error
handling.

Also, fix a very minor typo, ``"noreply`` in a nearby line.
pinterest/pymemcache,sontek/pymemcache,pinterest/pymemcache,sontek/pymemcache