Fix `wasmi_collections` docs for all features toggles

[codecov[bot]]

Codecov Report

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

Project coverage is 81.52%. Comparing base (0acac9d) to head (591ef30). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1285 +/- ## ======================================= Coverage 81.52% 81.52% ======================================= Files 306 306 Lines 25277 25277 ======================================= Hits 20607 20607 Misses 4670 4670 ```

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