chore: update executor docstring

[ZiniuYu]

This pr adds docstring to CLIP executors
Also fix some typo and misinformation in the docs

[codecov]

Codecov Report

Merging #806 (1a2f80e) into main (3c43eed) will decrease coverage by 2.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #806      +/-   ##
==========================================
- Coverage   84.10%   81.85%   -2.26%     
==========================================
  Files          21       21              
  Lines        1466     1466              
==========================================
- Hits         1233     1200      -33     
- Misses        233      266      +33     

Flag	Coverage Δ
cas	81.85% <ø> (-2.26%)	⬇️

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Impacted Files	Coverage Δ
server/clip_server/executors/clip_onnx.py	84.05% <ø> (ø)
server/clip_server/executors/clip_tensorrt.py	92.72% <ø> (ø)
server/clip_server/executors/clip_torch.py	82.53% <ø> (ø)
server/clip_server/model/trt_utils.py	56.04% <0.00%> (-27.48%)	⬇️
server/clip_server/model/clip_trt.py	69.38% <0.00%> (-16.33%)	⬇️

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[github-actions]

📝 Docs are deployed on https://ft-exec-docstring--jina-docs.netlify.app 🎉

[numb3r3]

LGTM