Add "open in hf spaces" gradio button issue #73 (#15106)
* update XLMProphetNet link
* update DPR link
* change prophetnet link
* change link MBART
* change link GPT
* update gpt2 link
* ctrl update link
* update Transformer-XL link
* Update Reformer link
* update xlnet link
* bert update link
* udpate albert link
* roberta update link
* update distilbert link
* update convbert link
* update XLM link
* xlm roberta update link
* update Flaubert link
* update electra link
* update funnel transformer and longformer
* bart update link
* pegasus update link
* udpate marianmt link
* t5 update link
* mt5 update link