rename vertex to dot and edge to curve

[Mitchell Tannenbaum]

graphs aren't 3D, so a raised point isn't a good term, whereas dots are non-spatial(?) locations
edges as well signify a 3D concept, whereas lines (again, a non-spatial term) going between dots can show connections. and since lines are just straight curves, we can use the broader concept to allow for any directional path connecting two dots
from my research into the origin of the terms, the man who started graph theory made them and they had no review
also, D & C are good terms for graphs, like J & K or X & Y, and they're simple to visualize accurately