docs: update finetuner docs

[jemmyshin]

since finetuner updates their model repo, we need to update our docs. Also we need to specify to_onnx=True in finetuner.fit()

[codecov[bot]]

Codecov Report

Merging #843 (ea2ec7d) into main (87fdc54) will decrease coverage by 2.09%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #843      +/-   ##
==========================================
- Coverage   81.58%   79.49%   -2.10%     
==========================================
  Files          21       21              
  Lines        1575     1575              
==========================================
- Hits         1285     1252      -33     
- Misses        290      323      +33     

Flag	Coverage Δ
cas	79.49% <ø> (-2.10%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/clip_server/model/trt_utils.py	56.04% <0.00%> (-27.48%)	:arrow_down:
server/clip_server/model/clip_trt.py	69.38% <0.00%> (-16.33%)	:arrow_down:

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

[github-actions[bot]]

:memo: Docs are deployed on https://ft-docs-finetuner-update--jina-docs.netlify.app :tada: