Include a comment that explains the humanness check

Following a suggestion from @branan, I've added a comment that points out
that the controller makes a different sized kinematic actor if the
armature is human (male or female)

Sources/Plasma/PubUtilLib/plAvatar/plArmatureMod.cpp

@@ -1993,7 +1993,11 @@ bool plArmatureMod::ValidatePhysics()
         return false;
 
     if (!fController)
-        fController = plPhysicalControllerCore::Create(GetTarget(0)->GetKey(), fPhysHeight, fPhysWidth, (fBodyType == kBoneBaseMale || fBodyType == kBoneBaseFemale));
+    {
+        // The kinematic actor is made taller if the avatar is human (male or female)
+        fController = plPhysicalControllerCore::Create(GetTarget(0)->GetKey(), fPhysHeight,
+                      fPhysWidth, (fBodyType == kBoneBaseMale || fBodyType == kBoneBaseFemale));
+    }
 
     if (fController)
     {