Addition and Correction to “K<sub>2</sub>Mn<sub>3</sub>O(OH)(VO<sub>4</sub>)(V<sub>2</sub>O<sub>7</sub>) with Sawtooth Chains of Multivalent Manganese Triangular Trimer Units: Magnetic Susceptibility Shrouding a Long-Range Antiferromagnetic Order of Ferromagnetic Triangles”