add title

projects/nshmp-apps/src/app/designmaps/rtgm/components/plots/plots.component.html

 <nshmp-lib-ng-plots-container>
-  <nshmp-lib-ng-alert>
+  <nshmp-lib-ng-alert title="Calculations">
     This application currently performs the RTGM calculation for a single
     intensity measure (IM) hazard curve at a time. For bulk calculation of RTGMs
     for a larger number of IM hazard curves, please refer to