sequence -> iterable in tutorial (#8067)

Very minor follow to https://github.com/astral-sh/ruff/pull/8066/

docs/tutorial.md

@@ -22,7 +22,7 @@ import os
 
 
 def sum_even_numbers(numbers: Iterable[int]) -> int:
-    """Given a sequence of integers, return the sum of all even numbers in the sequence."""
+    """Given an iterable of integers, return the sum of all even numbers in the iterable."""
     return sum(num for num in numbers if num % 2 == 0)
 ```
 
@@ -61,7 +61,7 @@ Running `git diff` shows the following:
 -
 
 def sum_even_numbers(numbers: Iterable[int]) -> int:
-    """Given a sequence of integers, return the sum of all even numbers in the sequence."""
+    """Given an iterable of integers, return the sum of all even numbers in the iterable."""
     return sum(num for num in numbers if num % 2 == 0)
 ```
 
@@ -184,7 +184,7 @@ from typing import Iterable  # noqa: UP035
 
 
 def sum_even_numbers(numbers: Iterable[int]) -> int:
-    """Given a sequence of integers, return the sum of all even numbers in the sequence."""
+    """Given an iterable of integers, return the sum of all even numbers in the iterable."""
     return sum(num for num in numbers if num % 2 == 0)
 ```
 
@@ -206,7 +206,7 @@ from typing import Iterable
 
 
 def sum_even_numbers(numbers: Iterable[int]) -> int:
-    """Given a sequence of integers, return the sum of all even numbers in the sequence."""
+    """Given an iterable of integers, return the sum of all even numbers in the iterable."""
     return sum(num for num in numbers if num % 2 == 0)
 ```