Update to Unit One READMEs

unit-one/lessons/4_functions.md

@@ -39,7 +39,7 @@ In Sui Move, entry functions are simply functions that can be called by transact
 
 Functions called directly through a transaction typically have an instance of `TxContext` as the last parameter. This is a special parameter set by the Sui Move VM and does not need to be specified by the user calling the function. 
 
-The `TxContext` object contains [essential information](https://github.com/MystenLabs/sui/blob/main/crates/sui-framework/packages/sui-framework/sources/tx_context.move) about the transaction used to call the entry function, such as the sender's address, the signer's address, the tx's epoch, etc. 
+The `TxContext` object contains [essential information](https://github.com/MystenLabs/sui/blob/main/crates/sui-framework/packages/sui-framework/sources/tx_context.move) about the transaction used to call the entry function, such as the sender's address, the tx's digest ID, the tx's epoch, etc. 
 
 ## Create the `mint` Function 
 
@@ -55,5 +55,5 @@ We can define our minting function in the Hello World example as the following:
     }
 ```
 
-This function simply creates a new instance of the `HelloWorldObject` custom type, then uses the Sui system [`public_transfer`](https://github.com/MystenLabs/sui/blob/main/crates/sui-framework/docs/transfer.md#function-public_transfer) function to send it to the transaction caller. 
+This function simply creates a new instance of the `HelloWorldObject` custom type, then uses the Sui system [`public_transfer`](https://github.com/MystenLabs/sui/blob/main/crates/sui-framework/docs/sui-framework/transfer.md#function-public_transfer) function to send it to the transaction caller.