Add javadoc tag to avoid duplication of return information in simple situations.

For a simple, getFoo method, the recommended correct javadoc is

/**
 * Returns a Foo.
 * @return a Foo.
 */
Foo getFoo()

This pattern is quite redundant, tedious to maintain, and clumsy to read in the sources.

It would be preferable if a single javadoc tag, say {@Return } could be used in these situations like

/**
 * {@Returns} a Foo.
 */
Foo getFoo()

which would have the same effect as the method javadoc with a separate @return tag as above.

The use of the {@Returns} tag would be intended for simple situation where there was a direct (near) repetition of the initial sentence and the @return tag. When such repetition was not present or desirable, the {@Returns} tag should not be used.