Unit typos in atmos_conversions.py

[matthewtownson]

Fix the errors in _r0_tocn2 and r0_to_seeing as described in #88

[codecov[bot]]

Codecov Report

Patch coverage has no change and project coverage change: +0.10 :tada:

Comparison is base (8669dec) 92.08% compared to head (df373ab) 92.18%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #92 +/- ## ========================================== + Coverage 92.08% 92.18% +0.10% ========================================== Files 42 42 Lines 1997 1997 ========================================== + Hits 1839 1841 +2 + Misses 158 156 -2 ``` | [Impacted Files](https://app.codecov.io/gh/AOtools/aotools/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AOtools) | Coverage Δ | | |---|---|---| | [aotools/turbulence/atmos\_conversions.py](https://app.codecov.io/gh/AOtools/aotools/pull/92?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AOtools#diff-YW90b29scy90dXJidWxlbmNlL2F0bW9zX2NvbnZlcnNpb25zLnB5) | `100.00% <ø> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/AOtools/aotools/pull/92/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AOtools)

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