Minor fixes to documentation for cran

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (73f6c95) 85.32% compared to head (0484a20) 85.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #731 +/- ## ======================================= Coverage 85.32% 85.32% ======================================= Files 204 204 Lines 14689 14689 ======================================= Hits 12534 12534 Misses 2155 2155 ```

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