better docs

Author: mydea

packages/opentelemetry/src/propagator.ts

@@ -195,7 +195,8 @@ export function getInjectionData(context: Context): {
 } {
   const span = trace.getSpan(context);
 
-  // If we have a remote span, we need to ensure to use the span as parentSpanId, not spanId itself
+  // If we have a remote span, the spanId should be considered as the parentSpanId, not spanId itself
+  // Instead, we use a virtual (generated) spanId for propagation
   if (span && span.spanContext().isRemote) {
     const spanContext = span.spanContext();
     const dynamicSamplingContext = getDynamicSamplingContextFromSpan(span);