1.4 More Vector Math - distributive rule error

[Paul Myburgh]

At the bottom where it says: More Number Properties with Vectors, found a small error:

The distributive rule with 2 scalars, 1 vector: (n_m)_v =n_v +m_v

should be: (n+m)_v = n_v + m*v

[Daniel Shiffman]

thanks! duplicate #298