Consolidate API behaviour changes for 3.5

Author: QuLogic

doc/api/next_api_changes/behavior/14913-AL.rst

@@ -1,11 +1,3 @@
-Colorbar lines no longer clipped
-================================
-
-If a colorbar has lines added to it (e.g. for contour lines), these will
-no longer be clipped.  This is an improvement for lines on the edge of
-the colorbar, but could lead to lines off the colorbar if the limits of
-the colorbar are changed.
-
 ``Colorbar.patch`` is deprecated
 ================================