Errata for the errata

### Issue description

The code on page 101 of Processing 2nd edition is 7-32 not 7-23...

### URL(s) of affected page(s)

https://github.com/processing/processing-docs/wiki/Processing-Handbook-Errata

### Proposed fix

"pp. 101 - Line 13 of code 7-32 is incorrect,"