Refactor copyright header in span_processor.py for clarity and compliance

Author: Johan Broberg

libraries/microsoft-agents-a365-observability-core/microsoft_agents_a365/observability/core/trace_processor/span_processor.py

@@ -1,9 +1,7 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-"""Copyright (c) Microsoft. All rights reserved.
-
-Span processor for copying OpenTelemetry baggage entries onto spans.
+"""Span processor for copying OpenTelemetry baggage entries onto spans.
 
 This implementation assumes `opentelemetry.baggage.get_all` is available with the
 signature `get_all(context: Context | None) -> Mapping[str, object]`.