[Doc] Add note about (str, alpha) version added

oscargus · oscargus · commit c6c483bd4af1 · 2023-06-27T13:02:10.000+02:00
diff --git a/galleries/users_explain/colors/colors.py b/galleries/users_explain/colors/colors.py
@@ -70,6 +70,7 @@
 +--------------------------------------+--------------------------------------+
 | Tuple of one of the above color      | - ``('green', 0.3)``                 |
 | formats and an alpha float.          | - ``('#f00', 0.9)``                  |
+| .. versionadded:: 3.8                |                                      |
 +--------------------------------------+--------------------------------------+
 
 .. _xkcd color survey: https://xkcd.com/color/rgb/
