chore(curriculum): fixed typo (freeCodeCamp#59623)

Author: jnord0

curriculum/challenges/english/25-front-end-development/lab-email-masker/66b205e6eacba4c4e54ea434.md

@@ -16,7 +16,7 @@ Fulfill the user stories below and get all the tests to pass to complete the lab
 **User Stories:**
 
 1. Create a function named `maskEmail` that takes `email` as an argument.
-2. Inside the function, you should mask the `email` and append the domain name to it.  Remember that you can use methods like `slice`, `repeat`, `indexOf` `slice` or even `replace` to help you.
+2. Inside the function, you should mask the `email` and append the domain name to it.  Remember that you can use methods like `slice`, `repeat`, `indexOf` or even `replace` to help you.
 3. Outside the function, declare a variable named `email` to store the email address you want to mask.
 4. Call the `maskEmail` function with the `email` variable and output the result to the console. 
 5. `maskEmail("[email protected]")` should return `"a*******[email protected]"`.