Clarify meaning of <name/> in data type rewriting in manual

[lukaseder]

To be entirely accurate, the data type rewriting feature doesn't require the target type (as defined in <name/>) to be a type from org.jooq.impl.SQLDataType. It just rewrites the type as reported by the dictionary views to something else. Then, that type (as any type) is first matched against known vendor-specific types, and if unknown on that vendor, against org.jooq.impl.SQLDataType.

The manual should be updated accordingly.

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See:
https://groups.google.com/forum/#!topic/jooq-user/wMag-UTXjyk