docs: add rotation in docs

[charlesmindee]

This PR specifiy args to pass to predictors to work with rotated documents in the docs, and provides some snippets.

Any feedback is welcome!

Closes #807

[codecov]

Codecov Report

Merging #846 (fdaa811) into main (9b31588) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #846      +/-   ##
==========================================
- Coverage   95.94%   95.92%   -0.02%     
==========================================
  Files         133      133              
  Lines        5103     5103              
==========================================
- Hits         4896     4895       -1     
- Misses        207      208       +1     

Flag	Coverage Δ
unittests	95.92% <ø> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
doctr/transforms/functional/base.py	95.65% <0.00%> (-1.45%)	⬇️

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[fg-mindee]

Thanks for the PR!
A few typos to fix and we're good to go!

[fg-mindee]

Thanks!