style roxygen code examples that have nothing coming after them

[lorenzwalthert]

Closes #1067

[codecov-commenter]

Codecov Report

Merging #1089 (38e445d) into main (0b34e99) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1089      +/-   ##
==========================================
- Coverage   91.10%   91.03%   -0.08%     
==========================================
  Files          46       46              
  Lines        2699     2700       +1     
==========================================
- Hits         2459     2458       -1     
- Misses        240      242       +2     

Impacted Files	Coverage Δ
R/roxygen-examples-find.R	93.33% <100.00%> (-6.67%)	⬇️

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[github-actions]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 8d683de is merged into main:

•   :ballot_box_with_check:cache_applying: 49.1ms -> 49.7ms [-0.54%, +2.91%]
•   :ballot_box_with_check:cache_recording: 870ms -> 871ms [-0.41%, +0.69%]
•   :ballot_box_with_check:without_cache: 2.06s -> 2.06s [-1.08%, +0.48%]

Further explanation regarding interpretation and methodology can be found in the documentation.

[IndrajeetPatil]

LGTM, thanks!