Merge PR cosmos#4424: Update README.md

docs/intro/README.md

@@ -2,7 +2,7 @@
 
 ## What is the SDK?
 
-The [Cosmos-SDK](https://github.com/cosmos/cosmos-sdk) is a framework for building multi-asset public Proof-of-Stake (PoS) blockchains, like the Cosmos Hub, as well as permissionned Proof-Of-Authority (PoA) blockchains. Blockchains built with the Cosmos SDK are generally referred to as **application-specific blockchains**. 
+The [Cosmos-SDK](https://github.com/cosmos/cosmos-sdk) is a framework for building multi-asset public Proof-of-Stake (PoS) blockchains, like the Cosmos Hub, as well as permissioned Proof-Of-Authority (PoA) blockchains. Blockchains built with the Cosmos SDK are generally referred to as **application-specific blockchains**. 
 
 The goal of the Cosmos SDK is to allow developers to easily create custom blockchains from scratch that can natively interoperate with other blockchains. We envision the SDK as the Ruby-on-Rails-like framework to build secure blockchain applications on top of [Tendermint](https://github.com/tendermint/tendermint). SDK-based blockchains are built out of composable modules, most of which are open source and readily available for any developers to use. Anyone can create a module for the Cosmos-SDK, and integrating already-built modules is as simple as importing them into your blockchain application. What's more, the Cosmos SDK is a capabilities-based system, which allows developer to better reason about the security of interactions between modules. For a deeper look at capabilities, jump to [this section](./ocap.md).
 
@@ -18,7 +18,7 @@ To learn more about application-specific blockchains, [click here](./why-app-spe
 
 The Cosmos SDK is the most advanced framework for building custom application-specific blockchains today. Here are a few reasons why you might want to consider building your decentralised application with the Cosmos SDK:
 
-- The default consensus engine available within the SDK is [Tendermint Core](https://github.com/tendermint/tendermint). Tendermint is the most (and only) mature BFT consensus engine in existence. It is widely used accross the industry and is considered the gold standard consensus engine for building Proof-of-Stake systems.
+- The default consensus engine available within the SDK is [Tendermint Core](https://github.com/tendermint/tendermint). Tendermint is the most (and only) mature BFT consensus engine in existence. It is widely used across the industry and is considered the gold standard consensus engine for building Proof-of-Stake systems.
 - The SDK is open source and designed to make it easy to build blockchains out of composable modules. As the ecosystem of open source SDK modules grow, it will become increasingly easier to build complex decentralised platforms with it. 
 - The SDK is inspired by capabilities-based security, and informed by years of wrestling with blockchain state-machines. This makes the Cosmos SDK a very secure environment to build blockchains. 
 - Most importantly, the Cosmos SDK has already been used to build many application-specific blockchains that are already in production. Among others, we can cite [Cosmos Hub](https://hub.cosmos.network), [Iris](https://irisnet.org), [Binance Chain](https://docs.binance.org/), [Terra](https://terra.money/) or [Lino](https://lino.network/). Many more are building on the Cosmos SDK. You can get a view of the ecosystem [here](https://cosmos.network/ecosystem).