CR for Job #20142 - Walk Cycle Polish Description

Code Review for Job #20142 - Workitem available at https://www.worklist.net/20142
this for loop is still consistent with coding standard. It should be:

```
for(var n = 0; n < numHarmonics; n++) {
    harmonics += this.magnitudes[n] * Math.cos(n * twoPiFT - this.phaseAngles[n]);
}
```