add numbers to hints

exercises/concept/card-games/.docs/hints.md

@@ -1,36 +1,36 @@
 # Hints
 
-## Tracking Poker Rounds
+## 1. Tracking Poker Rounds
 
 - The [`list`][list] function returns a list consisting of the arguments it is passed.
 
-## Keeping all Rounds in the Same Place
+## 2. Keeping all Rounds in the Same Place
 
 - The [`concat`][concat] function can be used to concatenate two lists together.
 
-## Finding Prior Rounds
+## 3. Finding Prior Rounds
 
 - The [`some`][some] function will return the first logically true value in a collection.
 - [`boolean`][boolean] is useful in cases where a function returns a value but the tests are expecting a boolean.
 
-## Averaging Card Values
+## 4. Averaging Card Values
 
 - Recall basic arithmetic operators such as [`/`][division] and [`+`][addition].
 - A collection of numbers can be summed using either [`apply`][apply] or [`reduce`][reduce].
 - The [`count`][count] function returns the number of items in a collection.
 - The `/` function returns a ratio type when operating on integers. You can use [`double`][double] to convert a ratio to a decimal.
 
-## Alternate Averages
+## 5. Alternate Averages
 
 - There are sequence functions to return the [`first`][first] or [`last`] element of a sequential collection.
 - To find the middle card you can divide the number of cards by 2, round to the lowest integer with [`int`][int], and retrieve the card at that index using [`nth`][nth].
 - Use [`or`][or] to determine if either condition is true.
 
-## More Averaging Techniques
+## 6. More Averaging Techniques
 
 - One way of retrieving the cards at even/odd indices would be to [`map`][map] a function using [`nth`][nth] over a [`range`][range], which takes an optional `step` argument.
 
-## Bonus Round Rules
+## 7. Bonus Round Rules
 
 - Recall how to use [`if`][if] from the exercise on conditionals.
 - You can return all items of a collection except for the last one using [`butlast`][butlast].