bpo-23495: Correct the documentation for writerows() of csv Writer objects (GH-6316)


`writerows()` takes an iterable.
(cherry picked from commit a801cf164be7c62b6a6dba47ff91d6c3edb67729)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
diff --git a/Doc/library/csv.rst b/Doc/library/csv.rst
index e1290d4..08b8edc 100644
--- a/Doc/library/csv.rst
+++ b/Doc/library/csv.rst
@@ -452,8 +452,9 @@
 
 .. method:: csvwriter.writerows(rows)
 
-   Write all the *rows* parameters (a list of *row* objects as described above) to
-   the writer's file object, formatted according to the current dialect.
+   Write all elements in *rows* (an iterable of *row* objects as described
+   above) to the writer's file object, formatted according to the current
+   dialect.
 
 Writer objects have the following public attribute: