transformers

76a33a10 - model_summary.md - Restore link to Harvard's Annotated Transformer. (#29702)

model_summary.md - Restore link to Harvard's Annotated Transformer. (#29702) * model_summary.md - Add link to Harvard's Annotated Transformer. * model_summary.md - slight wording change + capitalize name of the paper * model_summary.md - moves the Annotated Transformer link in a praenthesis next to the link to the original paper (great idea, stevhliu!) * model_summary.md - moves the Annotated Transformer link in a praenthesis next to the link to the original paper (commit pt. 2, accidentally removed "has" in pt. 1)