Corrects the documentation for the otel_trace processor (#11043)

* Corrects the documentation for the otel_trace processor to clarify that it adds fields.

Signed-off-by: David Venable <dlv@amazon.com>

* Update _data-prepper/pipelines/configuration/processors/otel-traces.md

Signed-off-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>

---------

Signed-off-by: David Venable <dlv@amazon.com>
Signed-off-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>

Author: dlvenable

_data-prepper/pipelines/configuration/processors/otel-traces.md

@@ -10,9 +10,9 @@ nav_order: 260
 
 The `otel_trace` processor completes trace-group-related fields in all incoming OpenSearch Data Prepper span records by state caching the root span information for each `traceId`. 
 
-## Parameters
+## Usage
 
-This processor includes the following parameters.
+This processor adds the following fields to span events:
 
 * `traceGroup`: Root span name
 * `endTime`: End time of the entire trace in International Organization for Standardization (ISO) 8601 format