Altered exterm appropriately

Per the pages at:

http://www-pcmdi.llnl.gov/ipcc/model_documentation/MIROC3.2_medres.htm

and:
http://www-pcmdi.llnl.gov/ipcc/model_documentation/ipcc_model_documentation.php

The exterm should lack a space after "3.2."
Merge pull request #8 from justgo129/patch-5

Altered exterm appropriately