Update working-with-eth.md

Author: gustavo-grieco

program-analysis/echidna/basic/working-with-eth.md

@@ -10,7 +10,7 @@
 
 ## Introduction
 
-We will see how to use ether during the fuzzing fuzzed. The following smart contract will be used as example:
+We will see how to use ether during a fuzzing campaign. The following smart contract will be used as example:
 
 ```solidity
 contract C {