Fix docstrings

[nick863]

Description

Fix the problem with not showing docstrings for the evaluators. https://microsoft.github.io/promptflow/reference/python-library-reference/promptflow-evals/promptflow.evals.evaluators.html. See work item 3305596.

All Promptflow Contribution checklist:

• The pull request does not introduce [breaking changes].
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.
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General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

promptflow-evals test result

  9 files   -   3    9 suites   - 3   2h 29m 43s ⏱️ + 2h 9m 21s
 53 tests  -  29   46 ✅  -  36   7 💤 + 7  0 ❌ ±0 
477 runs   - 507  414 ✅  - 570  63 💤 +63  0 ❌ ±0 

Results for commit 4322a05. ± Comparison against base commit 756130c.

This pull request removes 82 and adds 53 tests. Note that renamed tests count towards both.

tests.evals.unittests.test_batch_run_context.TestBatchRunContext ‑ test_with_codeclient
tests.evals.unittests.test_batch_run_context.TestBatchRunContext ‑ test_with_pfclient
tests.evals.unittests.test_built_in_evaluator.TestBuiltInEvaluators ‑ test_fluency_evaluator
tests.evals.unittests.test_built_in_evaluator.TestBuiltInEvaluators ‑ test_fluency_evaluator_empty_string
tests.evals.unittests.test_built_in_evaluator.TestBuiltInEvaluators ‑ test_fluency_evaluator_non_string_inputs
tests.evals.unittests.test_chat_evaluator.TestChatEvaluator ‑ test_conversation_validation_invalid_citations
tests.evals.unittests.test_chat_evaluator.TestChatEvaluator ‑ test_conversation_validation_missing_role
tests.evals.unittests.test_chat_evaluator.TestChatEvaluator ‑ test_conversation_validation_normal
tests.evals.unittests.test_chat_evaluator.TestChatEvaluator ‑ test_conversation_validation_question_answer_not_paired
tests.evals.unittests.test_chat_evaluator.TestChatEvaluator ‑ test_per_turn_results_aggregation
…

tests.evals.e2etests.test_adv_simulator.TestAdvSimulator ‑ test_adv_conversation_sim_responds_with_responses
tests.evals.e2etests.test_adv_simulator.TestAdvSimulator ‑ test_adv_qa_sim_responds_with_one_response
tests.evals.e2etests.test_adv_simulator.TestAdvSimulator ‑ test_adv_sim_init_with_prod_url
tests.evals.e2etests.test_adv_simulator.TestAdvSimulator ‑ test_adv_summarization_jailbreak_sim_responds_with_responses
tests.evals.e2etests.test_adv_simulator.TestAdvSimulator ‑ test_adv_summarization_sim_responds_with_responses
tests.evals.e2etests.test_adv_simulator.TestAdvSimulator ‑ test_incorrect_scenario_raises_error
tests.evals.e2etests.test_builtin_evaluators.TestBuiltInEvaluators ‑ test_composite_evaluator_chat[False-True]
tests.evals.e2etests.test_builtin_evaluators.TestBuiltInEvaluators ‑ test_composite_evaluator_chat[True-True]
tests.evals.e2etests.test_builtin_evaluators.TestBuiltInEvaluators ‑ test_composite_evaluator_content_safety
tests.evals.e2etests.test_builtin_evaluators.TestBuiltInEvaluators ‑ test_composite_evaluator_content_safety_chat[False-False]
…

♻️ This comment has been updated with latest results.

[danielsc]

Can we please make sure to show the output format for each of these evaluators, too?