Updated for a typo (#4538)

### Description

Minor update to a typo.

### Other changes

None.

### Tested

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### Related issues

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### Backwards compatibility

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packages/docs/overview.md

@@ -8,13 +8,13 @@ This page provides some background on blockchain technology and explores the Cel
 
 ### Background and Key Concepts
 
-A **blockchain** or **cryptographic network** is a broad term used to describe a database maintained by a distributed set of computers that do not share a trust relationship or common ownership. This arrangement is referred to as **decentralized**. The content of a blockchain's database, or **ledger**, is authenticated using cryptographic techniques, preventing its contents being added to, edited or removed except according to a protocol operated by the network as a whole.
+A **blockchain** or **cryptographic network** is a broad term used to describe a database maintained by a distributed set of computers that do not share a trust relationship or common ownership. This arrangement is referred to as **decentralized**. The content of a blockchain's database, or **ledger**, is authenticated using cryptographic techniques, preventing its contents from being added to, edited or removed except according to a protocol operated by the network as a whole.
 
 The code of the Celo Blockchain has shared ancestry with [Ethereum](https://www.ethereum.org), blockchain software for building general-purpose decentralized applications. Celo differs from Ethereum in several important areas as described in the following sections. However, it inherits a number of key concepts.
 
 Ethereum applications are built using **smart contracts**. Smart contracts are programs written in languages like [Solidity](https://solidity.readthedocs.io/en/v0.5.10/) that produce bytecode for the **Ethereum Virtual Machine** or **EVM**, a runtime environment. Programs encoded in smart contracts receive messages and manipulate the blockchain ledger and are termed **on-chain**.
 
-Celo has a native unit of accounting, the cryptocurrency **CELO**, comparable to Ether on Ethereum. Celo's ledger consists of **accounts**, identified by an **address**. There are two types of account. **Externally owned accounts** have an associated CELO balance and are controlled by a user holding the associated public-private keypair. **Contract accounts** contain the code and data of a single smart contract which can be called and manipulate its own stored data.
+Celo has a native unit of accounting, the cryptocurrency **CELO**, comparable to Ether on Ethereum. Celo's ledger consists of **accounts**, identified by an **address**. There are two types of accounts. **Externally owned accounts** have an associated CELO balance and are controlled by a user holding the associated public-private keypair. **Contract accounts** contain the code and data of a single smart contract which can be called and manipulate its own stored data.
 
 **ERC-20** is a standard interface for implementing cryptocurrencies or **tokens** as contracts, rather than via account balances. In Celo, CELO has a duality as both the native currency and is also an ERC-20 token on the Celo blockchain.