[PEAK] Docstring for peak.config.modules

[John Landahl]

The example shown at the beginning of the docstring for
peak.config.modules says 'binding.setupModule()' where it should say
'config.setupModule()'.  Also, it might be more helpful for new users if
the import statement there was "from peak.api import config" rather than
"from peak.api import *".

BTW, I've just tried module inheritance for the first time, and it looks
like it could be a very powerful feature when used in moderation.  Is it
considered a stable, longterm feature of PEAK?

- John