Discrepancy between namespacing in MySQL.pm and README/docstring

[cruatta]

I found a small typo in the readme and docstring for MySQL.pm. The namespace is shown as Collectd::Plugins which does not match the namespace for MySQL.pm. One point of interest is that the collectd docs say Perl plugins should use the Collectd::Plugins namespace while all these plugins use the Collectd::Plugin namespace. I wanted your opinion on whether to change the plugins' namespaces to match the best practices or update the readme and docstrings to show Collectd::Plugin.