Documentation for the sync engine

[art049]

Document the feature added by #231
@tiangolo I would be glad to have your feedback on this :)

[github-actions]

🚀 Deployed on https://docs-preview-238--odmantic.netlify.app

[codecov]

Codecov Report

Merging #238 (8e15fa5) into master (38ffda7) will not change coverage.
The diff coverage is n/a.

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##            master      #238   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           38        38           
  Lines         3480      3480           
  Branches       590       590           
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  Hits          3480      3480           

Flag	Coverage Δ
tests-3.10-4-standalone	98.50% <ø> (ø)
tests-3.10-4.2-standalone	98.50% <ø> (ø)
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tests-3.7-4-standalone	98.55% <ø> (ø)
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tests-3.7-4.4-standalone	98.55% <ø> (ø)
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tests-3.8-4-standalone	98.50% <ø> (ø)
tests-3.8-4.2-sharded	97.32% <ø> (ø)
tests-3.8-4.2-standalone	98.50% <ø> (ø)
tests-3.8-4.4-standalone	98.50% <ø> (ø)
tests-3.9-4-standalone	98.39% <ø> (ø)
tests-3.9-4.2-standalone	98.39% <ø> (ø)
tests-3.9-4.4-standalone	98.39% <ø> (ø)

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[tiangolo]

Amazing! 🚀 🎉

Thanks for doing this!

Also, super clever trick with the async_sync_snippet(), I didn't know that!

After this, I guess it would make sense to give a pass to the general docs wherever it says "this is an async ODM" to say "sync and async". 😎