Elementary Matrix in Value::Matrix

[pstaabp]

I think there is either an error with the elementary matrix that is created with Value::Matrix->E or a discrepancy in the documentation.

The example in the POD is: Value::Matrix->E(4, [ 3, 2 ], -3); which from the documentation is that this is the elementary matrix to row 3 by -3 and add to row 2. I think the correct answer should be

1 0 0 0 
0 1 -3 0 
0 0 1 0 
0 0 0 1
```
which is the transpose of the answer shown in the documentation as well as the answer created with the code above. 

I'll put in a fix for a PR, but want to double check that I'm interpreting everything correctly. 

[Alex-Jordan]

Yes, it seems wrong. It looks like at line 1150, there is an indexing mismatch between the $i that starts indexing at 0, and the row counters that start indexing at 1. But that's just a guess.

Also the POD (but not the actual code, I think) has an error with what the Value::Matrix->E(4, [2], 3); produces.

[pstaabp]

I'll put in a PR for a fix for this.