GitLab

* Typos/fixes to link syntax

* Trying section headers

* Add header formatting for Rule #3

* Add tutorial doc for TF + TPU

* Fix all those extra asterisks in the markdown

* Use the actual Tip formatting

* Remove unnecessary spaces

* Reformat checklist

* Fix checklist and reformat tips slightly

* Update docs/source/en/perf_train_tpu_tf.mdx
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Update docs/source/en/perf_train_tpu_tf.mdx
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Update docs/source/en/perf_train_tpu_tf.mdx
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

* Update docs/source/en/perf_train_tpu_tf.mdx
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

* Add link to TPU notebook in the notebooks list

* Add links to the TPU notebook in the tutorial doc

* Make the markdown table a bit less wild

* Fix notebook link

* More notebook links

* More fixes to wild tables

---------
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>