docs(accounts): added doc blocks

[manchuck]

Description

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[codecov-commenter]

Codecov Report

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

Comparison is base (ea2de27) 84.14% compared to head (24fc0b1) 84.14%. Report is 5 commits behind head on 3.x.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 3.x #878 +/- ## ======================================= Coverage 84.14% 84.14% ======================================= Files 123 123 Lines 1646 1646 Branches 314 314 ======================================= Hits 1385 1385 Misses 260 260 Partials 1 1 ```

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