Clarify choose method

gtsam/hybrid/HybridBayesNet.cpp

@@ -206,7 +206,7 @@ GaussianBayesNet HybridBayesNet::choose(
   for (auto &&conditional : *this) {
     if (auto gm = conditional->asHybrid()) {
       // If conditional is hybrid, select based on assignment.
-      gbn.push_back((*gm)(assignment));
+      gbn.push_back(gm->choose(assignment));
     } else if (auto gc = conditional->asGaussian()) {
       // If continuous only, add Gaussian conditional.
       gbn.push_back(gc);

gtsam/hybrid/HybridBayesNet.h

@@ -127,6 +127,8 @@ class GTSAM_EXPORT HybridBayesNet : public BayesNet<HybridConditional> {
    * @brief Get the Gaussian Bayes Net which corresponds to a specific discrete
    * value assignment.
    *
+   * @note Any pure discrete factors are ignored.
+   *
    * @param assignment The discrete value assignment for the discrete keys.
    * @return GaussianBayesNet
    */