Clarify mouse behaviour for Window.relative_mouse

Author: Mega-JC

docs/reST/ref/sdl2_video.rst

@@ -123,9 +123,8 @@
 
       *This function will flush any pending mouse motion."*
 
-      If :func:`pygame.mouse.set_visible` was called with ``True`` the input
-      will be grabbed, and the mouse will enter endless relative motion mode.
-
+      Calling :func:`pygame.mouse.set_visible` with argument
+      ``True`` will exit relative mouse mode.
 
    .. attribute:: title
 

src_c/cython/pygame/_sdl2/video.pyx

@@ -295,8 +295,8 @@ cdef class Window:
 
         *This function will flush any pending mouse motion."*
 
-        If :func:`pygame.mouse.set_visible` was called with ``True`` the input
-        will be grabbed, and the mouse will enter endless relative motion mode.
+        Calling :func:`pygame.mouse.set_visible` with argument
+        ``True`` will exit relative mouse mode.
         """
         return SDL_GetRelativeMouseMode()