Mixed Valent, Distorted Cobalt Ludwigite (Co<sub>3</sub>BO<sub>5</sub>/Co<sub>3</sub>O<sub>2</sub>BO<sub>3</sub>) and Its Composite with Reduced Multiwalled Carbon Nanotubes (R‐MWCNT) in Enhancing the Domain Edge‐Sharing Oxygen as Superior Water Oxidation Electrocatalysts