docs: clarify defer's ephemeral arg

[JustaSqu1d]

Summary

This should be something that can be clarified in the docs.

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have NOT updated the changelog to include these changes.

[codecov]

Codecov Report

Merging #2053 (51cf382) into master (bd28a34) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 51cf382 differs from pull request most recent head 1f23643. Consider uploading reports for the commit 1f23643 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2053   +/-   ##
=======================================
  Coverage   33.24%   33.24%           
=======================================
  Files          97       97           
  Lines       19036    19033    -3     
=======================================
  Hits         6328     6328           
+ Misses      12708    12705    -3     

Flag	Coverage Δ
macos-latest-3.10	33.23% <ø> (+<0.01%)	⬆️
macos-latest-3.11	33.23% <ø> (+<0.01%)	⬆️
macos-latest-3.8	33.24% <ø> (+<0.01%)	⬆️
macos-latest-3.9	33.24% <ø> (+<0.01%)	⬆️
ubuntu-latest-3.10	33.23% <ø> (+<0.01%)	⬆️
ubuntu-latest-3.11	33.23% <ø> (+<0.01%)	⬆️
ubuntu-latest-3.8	33.24% <ø> (+<0.01%)	⬆️
ubuntu-latest-3.9	33.24% <ø> (+<0.01%)	⬆️
windows-latest-3.10	33.23% <ø> (+<0.01%)	⬆️
windows-latest-3.11	33.23% <ø> (+<0.01%)	⬆️
windows-latest-3.8	33.24% <ø> (+<0.01%)	⬆️
windows-latest-3.9	33.24% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
discord/interactions.py	19.54% <ø> (ø)

... and 1 file with indirect coverage changes

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[pullapprove4]

Please add a changelog entry