Merge remote-tracking branch 'origin/fix/hard-copy-var-assign' into fix/hard-copy-var-assign

Author: SteveBronder

test/unit/math/rev/core/var_test.cpp

@@ -966,12 +966,12 @@ TEST_F(AgradRev, assign_nan_matvar) {
  * In the case where we declare a var<Matrix> without initializing it, aka
  * `var_value<Eigen::MatrixXd>`, we need to think about what the equivalent
  *  behavior is for `Eigen::Matrix<var, -1, -1>`.
- * When default constructing `Eigen::Matrix<var, -1, -1>` we would have an array of `var` types
- * with `nullptr` as the vari. The first assignment to that array would then
- * just copy the vari pointer from the other array. This is the behavior we
- * want to mimic for `var_value<Eigen::MatrixXd>`. So in this test show that
- * for uninitialized `var_value<Eigen::MatrixXd>`, we can assign it and the
- * adjoints are the same as x.
+ * When default constructing `Eigen::Matrix<var, -1, -1>` we would have an array
+ * of `var` types with `nullptr` as the vari. The first assignment to that array
+ * would then just copy the vari pointer from the other array. This is the
+ * behavior we want to mimic for `var_value<Eigen::MatrixXd>`. So in this test
+ * show that for uninitialized `var_value<Eigen::MatrixXd>`, we can assign it
+ * and the adjoints are the same as x.
  */
 TEST_F(AgradRev, assign_nullptr_var) {
   using stan::math::var_value;