fix: zks_getBytecodeByHash doc (#413)

closes #412

Author: sarahschwartz

content/20.zksync-protocol/10.api/40.zks-rpc.md

@@ -266,15 +266,15 @@ curl --request POST \
 
 ## `zks_getBytecodeByHash`
 
-Retrieves the bytecode of a transaction by its hash.
+Retrieves the bytecode of a contract by its bytecode hash.
 
 #### Parameters
 
-1. **DATA, 32 bytes** - hash of the transaction.
+1. **DATA, 32 bytes** - hash of the contract bytecode.
 
 #### Returns
 
-**Array of uint8** - array of the transaction's bytecode.
+**Array of uint8** - array of the contract's bytecode.
 
 #### Example Request