Two error on unsupported {roxygen2} @examplesIf condition

[lorenzwalthert]

Closes #826.

[codecov-commenter]

Codecov Report

Merging #833 (f9b9523) into master (f4390eb) will increase coverage by 0.20%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #833      +/-   ##
==========================================
+ Coverage   90.40%   90.60%   +0.20%     
==========================================
  Files          47       47              
  Lines        2419     2460      +41     
==========================================
+ Hits         2187     2229      +42     
+ Misses        232      231       -1     

Impacted Files	Coverage Δ
R/environments.R	100.00% <ø> (ø)
R/nest.R	100.00% <ø> (ø)
R/token-define.R	66.66% <ø> (ø)
R/ui-caching.R	100.00% <ø> (ø)
R/relevel.R	46.15% <100.00%> (ø)
R/roxygen-examples-add-remove.R	95.45% <100.00%> (+3.14%)	⬆️
R/roxygen-examples-parse.R	96.72% <100.00%> (+0.05%)	⬆️
R/roxygen-examples.R	98.24% <100.00%> (+0.32%)	⬆️
R/rules-indention.R	100.00% <100.00%> (ø)
R/rules-line-breaks.R	100.00% <100.00%> (ø)
... and 8 more

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[github-actions]

This is how benchmark results would change (along with a 95% confience interval in relative change) if 252b512 is merged into master:

• cache_applying: 0.04s -> 0.04s [-4.66%, +1.32%]
• cache_recording: 1.54s -> 1.54s [-1.23%, +0.96%]
• without_cache: 3.97s -> 3.98s [-0.68%, +0.98%]

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