Update README.md

Author: tommygonzaleza

exercises/016-century/README.md

@@ -10,7 +10,7 @@
 century(2000)
 ```
 
-## Example output:
+## Example output:
 
 + 20
 
@@ -20,4 +20,4 @@ century(2000)
 
 + If you don't know how to start solving this assignment, please, review a theory for this lesson: https://snakify.org/lessons/integer_float_numbers/
 
-+ You may also try step-by-step theory chunks: https://snakify.org/lessons/integer_float_numbers/steps/1/
++ You may also try step-by-step theory chunks: https://snakify.org/lessons/integer_float_numbers/steps/1/