Fixed a typo in blockchain readme

blockchain/README.md

@@ -11,8 +11,8 @@ Here are the key blockchain terminologies:
 - Cryptography
 
 ## Distributed Ledger Technology (DLT)
-First of all, a **ledger** is a book or collection of accounts that keeps track of account transactions. Usually, ledgers are **centralised**, meaning that they're controlled by a sole influence. These ledgers are physical records maintained by banks, governments, and other establishments to track financial transactions, ownership records, and any other essential information.
-However, this approach only serves as a hotbed for inefficieny and over-reliance on a sole entity.
+First of all, a **ledger** is a book or collection of accounts that keeps track of account transactions. Usually, ledgers are **centralised**, meaning that they're controlled by a sole influence. These ledgers are physical records maintained by banks, governments, and other establishments to track financial transactions, ownership records, and any other essential information. 
+However, this approach only serves as a hotbed for inefficiency and over-reliance on a sole entity.
 
 This is where Distributed Ledger Technology comes in. DLT represents a massive shift from centralised data management.