Swich ND-PBFT reference to Sieve, modify Consensus part in Glossary

Author: kchristidis

glossary.md

@@ -348,7 +348,7 @@ The main module on a node that is responsible to process transactions, deploy an
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 <td width="20%"><b>Consensus</b></td>
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-The default consensus algorithm of OBC is called ND-PBFT (ND stands for non-deterministic, Note this name is temporary). ND-PBFT is a new algorithm is enhanced from the “classic” PBFT consensus algorithm. The major value of ND-PBFT is that it allows validating nodes to do a best effort in identifying ND transactions.
+The default consensus algorithm of OBC is called Sieve. It is a new algorithm, enhancing the “classic” PBFT mechanism in that it allows validating nodes to do a best effort in identifying non-deterministic transactions.
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