bpo-35250: Correct a minor argument name in docs

Doc/library/turtle.rst

@@ -1360,7 +1360,7 @@ Using events
 
    :param fun: a function with two arguments which will be called with the
                coordinates of the clicked point on the canvas
-   :param num: number of the mouse-button, defaults to 1 (left mouse button)
+   :param btn: number of the mouse-button, defaults to 1 (left mouse button)
    :param add: ``True`` or ``False`` -- if ``True``, a new binding will be
                added, otherwise it will replace a former binding
 
@@ -1382,7 +1382,7 @@ Using events
 
    :param fun: a function with two arguments which will be called with the
                coordinates of the clicked point on the canvas
-   :param num: number of the mouse-button, defaults to 1 (left mouse button)
+   :param btn: number of the mouse-button, defaults to 1 (left mouse button)
    :param add: ``True`` or ``False`` -- if ``True``, a new binding will be
                added, otherwise it will replace a former binding
 
@@ -1407,7 +1407,7 @@ Using events
 
    :param fun: a function with two arguments which will be called with the
                coordinates of the clicked point on the canvas
-   :param num: number of the mouse-button, defaults to 1 (left mouse button)
+   :param btn: number of the mouse-button, defaults to 1 (left mouse button)
    :param add: ``True`` or ``False`` -- if ``True``, a new binding will be
                added, otherwise it will replace a former binding
 
@@ -1805,7 +1805,7 @@ Using screen events
 
    :param fun: a function with two arguments which will be called with the
                coordinates of the clicked point on the canvas
-   :param num: number of the mouse-button, defaults to 1 (left mouse button)
+   :param btn: number of the mouse-button, defaults to 1 (left mouse button)
    :param add: ``True`` or ``False`` -- if ``True``, a new binding will be
                added, otherwise it will replace a former binding
 

Lib/turtle.py

@@ -1352,7 +1352,7 @@ def onclick(self, fun, btn=1, add=None):
         Arguments:
         fun -- a function with two arguments, the coordinates of the
                clicked point on the canvas.
-        num -- the number of the mouse-button, defaults to 1
+        btn -- the number of the mouse-button, defaults to 1
 
         Example (for a TurtleScreen instance named screen)
 
@@ -3526,7 +3526,7 @@ def onclick(self, fun, btn=1, add=None):
         Arguments:
         fun --  a function with two arguments, to which will be assigned
                 the coordinates of the clicked point on the canvas.
-        num --  number of the mouse-button defaults to 1 (left mouse button).
+        btn --  number of the mouse-button defaults to 1 (left mouse button).
         add --  True or False. If True, new binding will be added, otherwise
                 it will replace a former binding.
 
@@ -3547,7 +3547,7 @@ def onrelease(self, fun, btn=1, add=None):
         Arguments:
         fun -- a function with two arguments, to which will be assigned
                 the coordinates of the clicked point on the canvas.
-        num --  number of the mouse-button defaults to 1 (left mouse button).
+        btn --  number of the mouse-button defaults to 1 (left mouse button).
 
         Example (for a MyTurtle instance named joe):
         >>> class MyTurtle(Turtle):
@@ -3572,7 +3572,7 @@ def ondrag(self, fun, btn=1, add=None):
         Arguments:
         fun -- a function with two arguments, to which will be assigned
                the coordinates of the clicked point on the canvas.
-        num -- number of the mouse-button defaults to 1 (left mouse button).
+        btn -- number of the mouse-button defaults to 1 (left mouse button).
 
         Every sequence of mouse-move-events on a turtle is preceded by a
         mouse-click event on that turtle.