message: Fix missing parameter documentation
diff: @@ -934,6 +934,7 @@ public:
  /**
  * Constructor.
  *
  + * @param[in] exec The execution paradigm for the solver.
  * @param[in] dim The Krylov dimension of the solver. Value of 0 will
  * let Ginkgo use its own internal default value.
  */
  