fix(challenges): update consecutive-numbers

A little bit harder by having as input consecutive numbers needed to consider

challenges/consecutive-numbers/README.md

@@ -4,26 +4,42 @@ Created by [@Divlo](https://github.com/Divlo) on 28 June 2021.
 
 ## Instructions
 
-Write a function which takes a list of integers, and which returns the (possibly empty) list of pairs of successive consecutive integers that there may be in the list.
+Write a function which takes a list of integers, and which returns the list of of successive consecutive integers that there may be in the list.
 
-### Input
-
-```txt
-7
-1
-2
-5
-3
-4
-```
-
-### Output
-
-```txt
-1, 2
-3, 4
-```
+First input, is the number of consecutive numbers needed to consider it as "consecutive", the second input is the list of integers.
 
 ## Examples
 
 See the `test` folder for examples of input/output.
+
+### Example 1
+
+#### Input
+
+```txt
+2
+5 ; 1 ; 2 ; 3 ; 8 ; -5 ; -4 ; 7
+```
+
+#### Output
+
+```txt
+1 ; 2
+2 ; 3
+-5 ; -4
+```
+
+### Example 2
+
+#### Input
+
+```txt
+3
+5 ; 1 ; 2 ; 3 ; 8 ; -5 ; -4 ; 7
+```
+
+#### Output
+
+```txt
+1 ; 2 ; 3
+```