docs(stars) correct grammar

subjects/stars/README.md

@@ -2,8 +2,7 @@
 
 ### Instructions
 
-Write a function named `stars` that takes a number as
-parameter and returns a string of stars (asterisks) 2^n long (2 to the nth power).
+Create a function named `stars` that takes a `u32` as an argument and returns a `String` of stars (asterisks). The number of stars returned is 2^n (2 to the nth power).
 
 ### Expected functions