Another Maxima/Gnuplot6 problem in the examples.

(Which are used in our testsuite).

Author: daute

NEWS.md

@@ -14,8 +14,8 @@
 - Kill Lisp (e.g. sbcl.exe) when closing wxMaxima. (#1963, #1922, #1824, #1199)
 - Correct heading colors (#2005)
 - Repaired the Equations->Solve numerical->Find numerical solution" menu (#2010)
-- One included example (10MinuteTutorial.wxm) was affected by the Maxima/Gnuplot 6
-  problem. (see #1960)
+- Included examples (10MinuteTutorial.wxm, testbench_simple.wxmx) were affected
+  by the Maxima/Gnuplot 6 problem. (see issue #1960)
 
 # 25.01.0