Docs: usage of j vs i

[muendlein]

Currently the documentation for VectorOfArray states:

A[i] # Returns the ith array in the vector of arrays
A[j, i] # Returns the jth component in the ith array
A[j1, ..., jN, i] # Returns the (j1,...,jN) component of the ith array

Followed by this sentence: "Also, vecarr_to_vectors(VA::AbstractVectorOfArray) returns a vector of the series for each component, that is, A[i,:] for each i. A plot recipe is provided, which plots the A[i,:] series."

I think the choice of i is pretty confusing in this sentence as j is used before to represent the component index. For consistency I propose using j:

"Also, vecarr_to_vectors(VA::AbstractVectorOfArray) returns a vector of the series for each component, that is, A[j,:] for each j. A plot recipe is provided, which plots the A[j,:] series."