Fix section of 2nd order linear ODE problem

This is a nonhomogeneous equation, so it makes more sense to be
included in the "undetermined coefficients" section than one of
the "homogeneous" ones.

Author: d-torrance

OpenProblemLibrary/FortLewis/DiffEq/2-Higher-order/05-Nonhomogeneous/Lebl-2-5-03.pg

@@ -5,7 +5,7 @@
 
 ## DBsubject(Differential equations)
 ## DBchapter(Higher order differential equations)
-## DBsection(Linear, constant coefficients, homogeneous (repeated roots))
+## DBsection(Undetermined coefficients)
 ## Date(01/30/2011)
 ## Institution(Fort Lewis College)
 ## Author(Paul Pearson)