starmath: Make examples of exponential function consistent

... by prefixing "func" so that it is the same as Exponential Function
in Functions of the Elements window (RID_EX in commands.src).

Change-Id: I823c345a0f376f0679930aa7975bdeb03575cd43
Reviewed-on: https://gerrit.libreoffice.org/22389Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: jan iversen <jani@documentfoundation.org>

starmath/source/ElementsDockingWindow.cxx

@@ -668,7 +668,7 @@ void SmElementsControl::build()
             addElement(aEquation, aEquation, "");
             aEquation = "f ( x ) = sum from { { i = 0 } } to { infinity } { {f^{(i)}(0)} over {i!} x^i}";
             addElement(aEquation, aEquation, "");
-            aEquation = "f ( x ) = {1} over {%sigma sqrt{2%pi} }e^-{{(x-%mu)^2} over {2%sigma^2}}";
+            aEquation = "f ( x ) = {1} over {%sigma sqrt{2%pi} }func e^-{{(x-%mu)^2} over {2%sigma^2}}";
             addElement(aEquation, aEquation, "");
         }
         break;