Update the Plugin class docstring

[codecov[bot]]

Codecov Report

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

Comparison is base (5ad1751) 83.31% compared to head (38cbc2c) 83.31%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## devel #601 +/- ## ======================================= Coverage 83.31% 83.31% ======================================= Files 78 78 Lines 6839 6839 ======================================= Hits 5698 5698 Misses 1141 1141 ```

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