Earlier description seemed to Ethereum specific, hence updated.
Also would be more accurate to say Hyperledger - (Specific project) instead of the umbrella term just "Hyperledger" because they have tons of projects.
Notably added: origin of smart contracts, example of smart contract, references.
The added content required a slight rewording of the previous content.
I removed (miners) from "... nodes(miners) ..." since a node is not equivalent to a miner. Not all nodes are miners (and it is crucial that this is the case!!) -> https://bitcointalk.org/index.php?topic=1734235.0
