415 documentation for winkler interval score

[LacombeLouis]

Description

Add description for all the metrics.

Fixes #415

Please remove options that are irrelevant.

• This change requires a documentation update

Checklist

• [x] I have read the contributing guidelines
• [x] I have updated the HISTORY.rst and AUTHORS.rst files
• [x] Linting passes successfully : make lint
• [x] Typing passes successfully : make type-check
• [x] Unit tests pass successfully : make tests
• [x] Coverage is 100% : make coverage
• [x] Documentation builds successfully : make doc

[codecov-commenter]

Codecov Report

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

Project coverage is 100.00%. Comparing base (614293e) to head (9dcca60). Report is 375 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #444 +/- ## ========================================== Coverage 100.00% 100.00% ========================================== Files 39 41 +2 Lines 4616 4803 +187 Branches 487 363 -124 ========================================== + Hits 4616 4803 +187 ```

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