adicionado comentario sobre resolucao

66-plus_one/python/66.py

@@ -5,9 +5,12 @@
 #
 # Increment the large integer by one and return the resulting array of digits.
 
-# só é preciso incrementar o valor no ultimo indice
-#   -> mas e se o numero for '129'? o resultado correcto será '130' e não '120'
-#
+# increment by one the last index of the array.
+# iterate backwards, from the last index until index 0,
+# if the index as a value of 10, set it to 0;
+#   if this is the index 0, insert the value 1 at index 1,
+#   otherwise increment the previous index by 1
+#   (we are running backwards in the array)
 
 
 def plusOne(digits: list[int]) -> list[int]: