fix[docs]: Fix mismatched backticks

[augustebaum]

Changes

Fixes a mismatched backtick that made the online docs render wrong: https://pytask-dev.readthedocs.io/en/stable/tutorials/repeating_tasks_with_different_inputs.html#user-defined-ids

Todo

• Reference issues which can be closed due to this PR with "Closes #x".
• Review whether the documentation needs to be updated.
• Document PR in docs/changes.rst.

[codecov]

Codecov Report

Merging #303 (a91ef27) into main (1112432) will not change coverage.
The diff coverage is n/a.

❗ Current head a91ef27 differs from pull request most recent head ad94950. Consider uploading reports for the commit ad94950 to get more accurate results

@@           Coverage Diff           @@
##             main     #303   +/-   ##
=======================================
  Coverage   96.68%   96.68%           
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  Files          91       91           
  Lines        7778     7778           
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  Hits         7520     7520           
  Misses        258      258           

Flag	Coverage Δ
end_to_end	82.81% <ø> (ø)
integration	40.98% <ø> (ø)
unit	68.70% <ø> (ø)

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[tobiasraabe]

Thank you very much, @augustebaum!