added instructions for syncing upstream master with forked master via PR (#8745)
added instructions for syncing upstream master with forked master via PR (#8745)

* added instructions for syncing upstream master with forked master via PR

* expand to add a note to why this is requested

Co-authored-by: Stas Bekman <7755b8071ff7368c870e3a79649c5b25a8766143@users.noreply.github.com>
huggingface/transformers,huggingface/transformers,huggingface/transformers,huggingface/transformers,huggingface/pytorch-transformers