refactor(csv): align additional error messages

[irbull]

Aligns the error messages in the csv folder to match the style guide.

https://github.com/denoland/std/issues/5574

[codecov[bot]]

Codecov Report

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

Project coverage is 96.23%. Comparing base (c817a5a) to head (357b5c4). Report is 18 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5796 +/- ## ========================================== - Coverage 96.23% 96.23% -0.01% ========================================== Files 480 480 Lines 38748 38754 +6 Branches 5616 5617 +1 ========================================== + Hits 37291 37294 +3 - Misses 1416 1419 +3 Partials 41 41 ```

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