Improves docs and handling of entities and resuming by WandbLogger (#3264)

* adds latest tag to match wandb defaults

* adds entity handling, 'last' tag

* fixes bug causing finished runs to resume

* removes redundant "last" tag for wandb artifact

train.py

@@ -443,7 +443,7 @@ def train(hyp, opt, device, tb_writer=None):
         if wandb_logger.wandb and not opt.evolve:  # Log the stripped model
             wandb_logger.wandb.log_artifact(str(final), type='model',
                                             name='run_' + wandb_logger.wandb_run.id + '_model',
-                                            aliases=['last', 'best', 'stripped'])
+                                            aliases=['latest', 'best', 'stripped'])
         wandb_logger.finish_run()
     else:
         dist.destroy_process_group()