Fix up LaTeX <div class="latex"> envs in Source_custom.comp

Author: willend

mcstas-comps/contrib/Source_custom.comp

@@ -40,15 +40,25 @@
 * <b>Model description:</b>
 *
 * The normalised Maxwellian distribution for moderated neutrons is defined by [1]
+* <div class="latex">
 *   $M(\lambda)=\frac{2a^2}{T^2\lambda^5}\exp\left(-\frac{a}{T\lambda^{2}}\right)$
+* </div>
 * where
+* <div class="latex">
 *   $a=\left(\frac{h^2}{2m_{N}k_{B}}\right)$
+* </div>
 * and the joining function for the under-moderated neutrons is given by [1]
+* <div class="latex">
 *   $M(\lambda)_{um}=\frac{1}{\lambda(1+\exp(\lambda\chi-\kappa))}$
+* </div>
 *
 * The normalised time structure of the long pulse is defined by [2]
+* <div class="latex">
 *   $N_{t<=t_p}=1-\exp\left(-\frac{t}{\tau/n}\right)$
+* </div>
+* <div class="latex">
 *   $N_{t>t_p}=\exp\left(-\frac{t-t_p}{\tau}\right)-\exp\left(-\frac{t}{\tau/n}\right)$
+* </div>
 * where tp is the pulse period, tau is the pulse decay time constant, and n is the ratio of decay to ascend time constants.
 *
 * <b>Parameters for some sources:</b>