Fix README.md typos

README.md

@@ -16,7 +16,7 @@ Libra Core implements a decentralized, programmable database which provides a fi
 
 ## Contributing
 
-Read our [Contrbuting guide](https://developers.libra.org/docs/community/contributing). Find out what’s coming on our [blog](https://developers.libra.org/blog/2019/06/18/The-Path-Forward).
+Read our [Contributing guide](https://developers.libra.org/docs/community/contributing). Find out what’s coming on our [blog](https://developers.libra.org/blog/2019/06/18/The-Path-Forward).
 
 ## Getting Started
 

consensus/README.md

@@ -10,7 +10,7 @@ The consensus component supports state machine replication using the LibraBFT co
 
 ## Overview
 
-A consensus protocol allows a set of validators to create the logical appearance of a single database. The consensus protocol replicates submitted transactions among the validators, executes potential transactions against the current database, and then agrees on a binding commitment to the ordering of transactions and resulting execution. As a result, all validators can maintain an identical database for a given version number following the [state machine replication paradigm](https://dl.acm.org/citation.cfm?id=98167). The Libra Blockchain uses a variant of the [HotStuff consensus protocool](https://arxiv.org/pdf/1803.05069.pdf), a recent Byzantine fault-tolerant ([BFT](https://en.wikipedia.org/wiki/Byzantine_fault)) consensus protocol, called LibraBFT. It provides safety (all honest validators agree on commits and execution) and liveness (commits are continually produced) in the partial synchrony model defined in the paper "Consensus in the Presence of Partial Synchrony" by Dwork, Lynch, and Stockmeyer ([DLS](https://groups.csail.mit.edu/tds/papers/Lynch/jacm88.pdf)) and used in [PBFT](http://pmg.csail.mit.edu/papers/osdi99.pdf) as well as newer protocols such as [Tendermint](https://arxiv.org/abs/1807.04938). In this document, we present a high-level description of the LibraBFT protocol and discuss how the code is organized. See [here](https://developers.libra.org/docs/the-libra-blockchain-paper) to learn how LibraBFT fits into the Libra Blockchain. For details on the specifications and proofs of LibraBFT, read the full [technical report](https://developers.libra.org/docs/state-machine-replication-paper).
+A consensus protocol allows a set of validators to create the logical appearance of a single database. The consensus protocol replicates submitted transactions among the validators, executes potential transactions against the current database, and then agrees on a binding commitment to the ordering of transactions and resulting execution. As a result, all validators can maintain an identical database for a given version number following the [state machine replication paradigm](https://dl.acm.org/citation.cfm?id=98167). The Libra Blockchain uses a variant of the [HotStuff consensus protocol](https://arxiv.org/pdf/1803.05069.pdf), a recent Byzantine fault-tolerant ([BFT](https://en.wikipedia.org/wiki/Byzantine_fault)) consensus protocol, called LibraBFT. It provides safety (all honest validators agree on commits and execution) and liveness (commits are continually produced) in the partial synchrony model defined in the paper "Consensus in the Presence of Partial Synchrony" by Dwork, Lynch, and Stockmeyer ([DLS](https://groups.csail.mit.edu/tds/papers/Lynch/jacm88.pdf)) and used in [PBFT](http://pmg.csail.mit.edu/papers/osdi99.pdf) as well as newer protocols such as [Tendermint](https://arxiv.org/abs/1807.04938). In this document, we present a high-level description of the LibraBFT protocol and discuss how the code is organized. See [here](https://developers.libra.org/docs/the-libra-blockchain-paper) to learn how LibraBFT fits into the Libra Blockchain. For details on the specifications and proofs of LibraBFT, read the full [technical report](https://developers.libra.org/docs/state-machine-replication-paper).
 
 Agreement on the database state must be reached between validators, even if
 there are Byzantine faults. The Byzantine failures model allows some validators