Add documentation for graph paging options

Description

The graph documentation page currently has the following statement:

Note: at the time of writing (DSE 6.0), graph queries are never paged. Results are always returned as a single page. However, paging is on the roadmap for a future DSE version; the driver APIs reflect that, to avoid breaking changes when the feature is introduced.

This is not true anymore since JAVA-2099: we should remove this comment.

Also, we should add to this page a section about paging options under datastax-java-driver.advanced.graph.

And finally, we should also rewrite this example to use the new driver:

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Reporter

Alexandre Dutra

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