slab on grade repair

I'm considering buying a house in the suburbs of Houston, Texas and noticed on this house some of the exterior corners just under the brick (brick ledge) right at the corner, a piece of concrete chipped out (about a 4" chunk). I'm not worried about structural integrity because of the way the brick wall will carry the brick wall load but I'd like to patch it nonetheless. I noticed the neighbor did the same thing but he wasn't around to talk to. What is the best material to patch this corner to square it off (90 degrees) the way it should look? I didn't see any rebar just some large stone in the existing exposed concrete face. What will bond well with the existing concrete and look reasonably close in color? Neighbor's patch was a little bit lighter in color than the existing concrete around it.