fix docstrings after renaming ProdDestODEProblem

[codecov-commenter]

Codecov Report

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

Comparison is base (714a849) 99.21% compared to head (fc2dcc3) 99.21%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #12 +/- ## ======================================= Coverage 99.21% 99.21% ======================================= Files 3 3 Lines 255 255 ======================================= Hits 253 253 Misses 2 2 ``` | [Files](https://app.codecov.io/gh/SKopecz/PositiveIntegrators.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/mprk.jl](https://app.codecov.io/gh/SKopecz/PositiveIntegrators.jl/pull/12?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL21wcmsuamw=) | `100.00% <ø> (ø)` | |

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