ENH: beamEndLoad: enhanced comment

tutorials/stressAnalysis/solidEquilibriumDisplacementFoam/beamEndLoad/system/fvSolution

@@ -34,7 +34,7 @@ stressAnalysis
 {
     nCorrectors     1;
     D               1e-10;
-    accelerationFactor 2;
+    accelerationFactor 2;   // lower for other Poisson ratio (e.g. 0.1 for 0.3)
 }