Reinstate deleted @author tag

SPR-10411
Polish type prediction for generic factory methods

 - Now avoiding NullPointerExceptions in GenericTypeResolver's
   resolveReturnTypeForGenericMethod() in case the supplied ClassLoader
   is null.
 - AutowireUtils.resolveReturnTypeForFactoryMethod() now properly
   asserts that the supplied ClassLoader is not null.
 - Fixed copy-n-paste errors in Javadoc for
   AutowireUtils.resolveReturnTypeForFactoryMethod().

Issue: SPR-10411
Delete unused import in StdReflParamNameDscoverer
Add helper method to ResourceHandlerRegistry
Restored registration of nested component classes (even without factory methods)

Issue: SPR-10865
Issue: SPR-10970
Polishing

Issue: SPR-10185
Consistency between InvocableHandlerMethod in web and messaging modules
Polishing
Document 'annotated classes' in Testing chapter

In order to help developers avoid surprises from unintended use of
"@Bean Lite Mode" when referencing classes via @ContextConfiguration in
the TestContext framework, this commit duplicates the previous
discussion of "annotated classes" from the Javadoc for
@ContextConfiguration as a tip in the "Context configuration with
annotated classes" section of the Testing chapter in the reference
manual.

Issue: SPR-10971