Update models docs page

[joecummings]

Context: Our models page was not informative and things like tokenizers were missing.

Testing: Eyes

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchtune/954

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As of commit 165df00 with merge base 1e56b80 ():
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.05%. Comparing base (a978956) to head (57c991c).
Report is 32 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #954       +/-   ##
===========================================
- Coverage   66.39%   27.05%   -39.35%     
===========================================
  Files         155      174       +19     
  Lines        6484     7363      +879     
===========================================
- Hits         4305     1992     -2313     
- Misses       2179     5371     +3192     

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