Add comment and example to apache::thrift::get_pointer
Add comment and example to apache::thrift::get_pointer

Reviewed By: vitaut

Differential Revision: D39550590

fbshipit-source-id: 0d3f0b0c4642dbc9c855220acf1c37e76cb22a81

facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift,facebook/fbthrift