Fixes two issues in the tracing documentation (openai#1212)

1. **Grammar fix**: Remove duplicate "can" in the sentence about
configuring trace names
2. **Correct default value**: Update "Agent trace" to "Agent workflow"
to match the actual default value in the codebase

Author: DanielHashmi

docs/tracing.md

@@ -39,7 +39,7 @@ By default, the SDK traces the following:
 -   Audio outputs (text-to-speech) are wrapped in a `speech_span()`
 -   Related audio spans may be parented under a `speech_group_span()`
 
-By default, the trace is named "Agent trace". You can set this name if you use `trace`, or you can can configure the name and other properties with the [`RunConfig`][agents.run.RunConfig].
+By default, the trace is named "Agent workflow". You can set this name if you use `trace`, or you can configure the name and other properties with the [`RunConfig`][agents.run.RunConfig].
 
 In addition, you can set up [custom trace processors](#custom-tracing-processors) to push traces to other destinations (as a replacement, or secondary destination).