[SPR-6227] Parameterizing with Class<?> and Class<T> where appropriate; suppressing unchecked warnings; and fixed JavaDoc typos.

SPR-6206 - When looking up methods with @RequestMapping annotation, unannotated bridge methods are included

SPR-6214 - Using @ResponseBody throws HttpMediaTypeNotAcceptableException when it supports writing an acceptable MediaType

[SPR-6222] Updating PetClinic build documentation regarding migration to Spring Build and changes resulting from the upgrade to Spring 3.0.