chore: fix confusing doc

Author: taisho6339

opentelemetry-sdk/src/trace/mod.rs

@@ -140,10 +140,10 @@ mod tests {
         fn on_end(&self, span: SpanData) {
             // Fixed: Context::current() no longer panics from Drop
             // See https://github.com/open-telemetry/opentelemetry-rust/issues/2871
-            let current_cx = Context::current();
+            Context::current();
 
-            // IMPORTANT NOTE: The context returned here is the PARENT context,
-            // NOT the span's context (which has already been popped from the stack).
+            // IMPORTANT NOTE: The context returned here is whatever context happens
+            // to be current at this moment, which may be unrelated to the span being ended.
             // The span's baggage was extracted in on_start and stored as attributes.
 
             // Verify: on_start stored the baggage as an attribute
@@ -153,16 +153,6 @@ mod tests {
                     .any(|kv| kv.key.as_str() == "bag-key"),
                 "Baggage should have been stored as span attribute in on_start"
             );
-
-            // The current context's baggage is the parent's baggage (if any)
-            println!(
-                "on_end: parent context baggage = {:?}",
-                current_cx
-                    .baggage()
-                    .iter()
-                    .map(|(k, _)| k)
-                    .collect::<Vec<_>>()
-            );
         }
 
         fn force_flush(&self) -> crate::error::OTelSdkResult {