Add @examplesIf to internal examples where applicable

[edelarua]

What changes are proposed in this pull request?

• Added @examplesIf to applicable internal function examples. (Add @examplesIf to internal functions #118, @edelarua)

Closes #118

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Pre-review Checklist (if item does not apply, mark is as complete)

• All GitHub Action workflows pass with a ✅
• PR branch has pulled the most recent updates from master branch: usethis::pr_merge_main()
• If a bug was fixed, a unit test was added.
• If a new ard_*() function was added, it passes the ARD structural checks from cards::check_ard_structure().
• Code coverage is suitable for any new functions/features (generally, 100% coverage for new code): devtools::test_coverage()

Reviewer Checklist (if item does not apply, mark is as complete)

• If a bug was fixed, a unit test was added.
• Code coverage is suitable for any new functions/features: devtools::test_coverage()

When the branch is ready to be merged:

• Update NEWS.md with the changes from this pull request under the heading "# cardx (development version)". If there is an issue associated with the pull request, reference it in parentheses at the end update (see NEWS.md for examples).
• All GitHub Action workflows pass with a ✅
• Approve Pull Request
• Merge the PR. Please use "Squash and merge" or "Rebase and merge".

[github-actions]

Code Coverage Summary

Filename                        Stmts    Miss  Cover    Missing
----------------------------  -------  ------  -------  ------------------------------------
R/ard_aod_wald_test.R              77       8  89.61%   36-41, 91, 94
R/ard_car_anova.R                  45       2  95.56%   62, 65
R/ard_car_vif.R                    61       6  90.16%   37-40, 52, 86
R/ard_effectsize_cohens_d.R        88       2  97.73%   66, 111
R/ard_effectsize_hedges_g.R        82       2  97.56%   65, 115
R/ard_proportion_ci.R              42       5  88.10%   68-72
R/ard_regression_basic.R           15       1  93.33%   46
R/ard_regression.R                 50       0  100.00%
R/ard_smd_smd.R                    55       1  98.18%   48
R/ard_stats_anova.R               104      12  88.46%   120-126, 189-193
R/ard_stats_aov.R                  36       0  100.00%
R/ard_stats_chisq_test.R           39       1  97.44%   39
R/ard_stats_fisher_test.R          41       1  97.56%   39
R/ard_stats_kruskal_test.R         35       1  97.14%   38
R/ard_stats_mcnemar_test.R         49       1  97.96%   43
R/ard_stats_mood_test.R            48       1  97.92%   46
R/ard_stats_oneway_test.R          31       0  100.00%
R/ard_stats_prop_test.R            82       1  98.78%   40
R/ard_stats_t_test.R              110       2  98.18%   62, 108
R/ard_stats_wilcox_test.R          97       2  97.94%   62, 114
R/ard_survey_svychisq.R            37       1  97.30%   44
R/ard_survey_svycontinuous.R      193       2  98.96%   169, 179
R/ard_survey_svyranktest.R         51       0  100.00%
R/ard_survey_svyttest.R            50       0  100.00%
R/ard_survival_survfit.R          180       8  95.56%   78-80, 84, 94-96, 246
R/proportion_ci.R                 194      28  85.57%   290, 293, 302-307, 315, 330, 431-454
TOTAL                            1892      88  95.35%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 0a30bd3

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

  1 files   56 suites   9s ⏱️
 56 tests  37 ✅ 19 💤 0 ❌
152 runs  117 ✅ 35 💤 0 ❌

Results for commit 0a30bd3.

[ddsjoberg]

Thank you @edelarua !!