Provide missing documentation for migrating Cats' module's toPartialResult into asResult

[codecov[bot]]

Codecov Report

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

Project coverage is 87.71%. Comparing base (ccea90a) to head (4ffd96e). Report is 118 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #544 +/- ## ========================================== - Coverage 89.54% 87.71% -1.83% ========================================== Files 105 137 +32 Lines 2592 5471 +2879 Branches 235 451 +216 ========================================== + Hits 2321 4799 +2478 - Misses 271 672 +401 ```

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