Update documentation

[esantorella]

Summary: Changes:

• Removed Attributes block from BenchmarkMethod since it is incorrect: The actual attributes are identical to the arguments, and the listed attribute (scheduler_options) is actually a property.
• Expanded on docstring in BenchmarkProblem

Differential Revision: D66012030

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This pull request was exported from Phabricator. Differential Revision: D66012030

[codecov-commenter]

Codecov Report

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

Project coverage is 95.74%. Comparing base (0f17048) to head (ecc7015).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3072 +/- ## ======================================= Coverage 95.74% 95.74% ======================================= Files 488 488 Lines 49749 49749 ======================================= Hits 47634 47634 Misses 2115 2115 ```

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66012030

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66012030

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66012030

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D66012030

[facebook-github-bot]

This pull request has been merged in facebook/Ax@5eb6f2b430518edf69d5ba7070253f68fe816bdb.