[doc] fix flight recorder tutorial #3189
Merged
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Summary:
The small example code isn't rendering on the page.
Remove caption string as this seems to be the problem.
Test Plan:

Tested locally and on sandbox.
Without the fix: note missing code after "Note".
Broken screenshot:
Broken link here:
https://pytorch.org/tutorials/prototype/flight_recorder_tutorial.html#an-end-to-end-example
After the fix:

Fixed screenshot:
Sandbox link here:
https://docs-preview.pytorch.org/pytorch/tutorials/3189/prototype/flight_recorder_tutorial.html#an-end-to-end-example
Description
Checklist