Documentation improvements for published API reference

[Copilot]

The published reference docs (learn.microsoft.com/python/api/microsoft-opentelemetry) have broken cross-references, missing module/enum descriptions, internal-only notes, and a malformed docstring. These changes fix the docstrings and comments that drive doc generation.

Cross-references

Fully-qualify :func:/:class:/:meth:/:data: targets so the docfx build resolves them instead of emitting "Cross reference not found":

• use_microsoft_opentelemetry (opentelemetry/__init__.py)
• OpenTelemetryScope.inject_context_to_headers (a365/core/utils.py)
• OutputScope, A365_PARENT_TRACEPARENT_KEY (output_logging_middleware.py; also propagates to the re-exported middleware.* / hosting.* views)

# before — bare name, unresolved in published docs
""":func:`use_microsoft_opentelemetry`"""
# after — fully-qualified UID
""":func:`microsoft.opentelemetry.use_microsoft_opentelemetry`"""

Descriptions & content

• Enum/value members now documented via #: comments: MessageRole, FinishReason, Modality, ToolType, InferenceOperationType, GuardrailDecisionType, GuardrailRiskSeverity, GuardrailTargetType.
• Added package/module docstrings to a365/core, a365/langchain (was empty), a365/runtime, and a365/core/constants.py — bringing them in line with hosting.
• A365_PARENT_TRACEPARENT_KEY given a doc comment so it renders as a documented, linkable target.

Internal-facing text

Removed "Vendored from microsoft-agents-a365-observability*" lines from 6 exporter modules and the "Superset of…" note in a365/constants.py, replacing them with customer-centered summaries.

Malformed docstrings

• Reformatted the crammed reST :param:/:return: block in populate_invoke_agent_scope.py to Google style.
• Fixed an Unexpected indentation docutils error from indented URLs in models/messages.py.

All changes are docstring/comment-only except adding a doc comment to the existing A365_PARENT_TRACEPARENT_KEY constant.

[Copilot]

Pull request overview

This PR improves the docstrings and inline documentation that drive the published API reference for microsoft-opentelemetry, primarily to fix broken cross-references and to provide missing module/enum/constant descriptions for the Agent365 (a365) surface area.

Changes:

• Fully-qualifies Sphinx reST cross-reference targets (:func:, :meth:, :class:, :data:) to avoid “Cross reference not found” in docfx output.
• Adds/updates module docstrings and enum/constant member documentation so key symbols render with helpful descriptions.
• Reformats docstrings to avoid docutils formatting errors (e.g., indentation issues, cramped param blocks).

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/microsoft/opentelemetry/a365/runtime/init.py	Adds package docstring describing runtime helpers.
src/microsoft/opentelemetry/a365/langchain/init.py	Adds package docstring describing LangChain integration behavior.
src/microsoft/opentelemetry/a365/hosting/scope_helpers/populate_invoke_agent_scope.py	Reformats function docstring to Google-style sections.
src/microsoft/opentelemetry/a365/hosting/middleware/output_logging_middleware.py	Documents A365_PARENT_TRACEPARENT_KEY and fully-qualifies doc cross-references.
src/microsoft/opentelemetry/a365/core/utils.py	Fully-qualifies :meth: reference in get_traceparent docstring.
src/microsoft/opentelemetry/a365/core/tool_type.py	Adds per-member enum documentation comments.
src/microsoft/opentelemetry/a365/core/models/messages.py	Fixes module-docstring URL formatting; adds enum member docs.
src/microsoft/opentelemetry/a365/core/inference_operation_type.py	Adds per-member enum documentation comments.
src/microsoft/opentelemetry/a365/core/guardrail_target_type.py	Adds per-member constant documentation comments.
src/microsoft/opentelemetry/a365/core/guardrail_risk_severity.py	Adds per-member constant documentation comments.
src/microsoft/opentelemetry/a365/core/guardrail_decision_type.py	Adds per-member constant documentation comments.
src/microsoft/opentelemetry/a365/core/exporters/utils.py	Replaces internal “vendored from …” note with customer-facing summary.
src/microsoft/opentelemetry/a365/core/exporters/span_processor.py	Removes internal vendoring note from docstring.
src/microsoft/opentelemetry/a365/core/exporters/enriching_span_processor.py	Replaces internal “vendored from …” note with customer-facing summary.
src/microsoft/opentelemetry/a365/core/exporters/enriched_span.py	Replaces internal “vendored from …” note with customer-facing summary.
src/microsoft/opentelemetry/a365/core/exporters/agent365_exporter.py	Replaces internal “vendored from …” note with customer-facing summary.
src/microsoft/opentelemetry/a365/core/exporters/agent365_exporter_options.py	Rewrites module docstring to describe exported configuration options.
src/microsoft/opentelemetry/a365/core/constants.py	Converts header comment into a module docstring describing constant purpose.
src/microsoft/opentelemetry/a365/core/init.py	Adds module docstring summarizing the core primitives and surface area.
src/microsoft/opentelemetry/a365/constants.py	Replaces internal “superset of …” note with customer-facing summary.
src/microsoft/opentelemetry/init.py	Fully-qualifies use_microsoft_opentelemetry doc reference.

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