more grammar cleanup

subjects/has-city/README.md

@@ -2,10 +2,10 @@
 
 ### Instructions
 
-Create a function `hasCity` that takes a string called `country` and a array of strings named `cities`,
+Create a function `hasCity` that takes a string called `country` and a array of strings,
 which returns a new function. \
-The new function takes a string called `city` as a parameter which returns
-whether the string is part of the `cities` array or not.
+The new function takes a string, called `city`, as a parameter and which determines
+whether the array contains that string or not.
 
-If it is, it should return the string `<city> is a city from <country>`, otherwise
+If it does, it should return the string `<city> is a city from <country>`, otherwise
 `<city> is not a city from <country>`.