Alistair Coles 167f3c8cbd Update EC overview doc for PUT path
Update the EC overview docs 'under the hood' section to reflect the
change in durable file parity from 2 to ec_nparity + 1 [1].

Also fix some typos and cleanup the text.

[1] change id I80d666f61273e589d0990baa78fd657b3470785d

Change-Id: I23f6299da59ba8357da2bb5976d879d9a4bb173e
2015-09-30 09:45:57 +01:00
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