docs(froup-prices): correct grammar

subjects/group-price/README.md

@@ -2,11 +2,15 @@
 
 ### Instructions
 
-Create a `groupPrice` function, that can find a price in a given string.
-The function has to return an array of arrays with the full match of the price ($43.99)
-and the groups of that price, the first group(43) and the second group (99).
-If there is no match the function returns an empty array.
-Example:
-"The price is USD12.31"
-Expected output:
-[["USD12.31","12","31"]]
+Create a function named `groupPrice`, that can prices in a given string.
+
+Your function will return s 2D array with the full price breakdown.
+
+If there is no match, your function should return an empty array.
+
+### Example
+Given price of `USD12.31`:
+```
+[["USD12.31", "12", "31"]]
+```
+