Fix span option typo in SDK span End, and WithAttributes only being available on span start (#6006)

Author: dmathieu

sdk/trace/span.go

@@ -438,8 +438,8 @@ func truncate(limit int, s string) string {
 // End ends the span. This method does nothing if the span is already ended or
 // is not being recorded.
 //
-// The only SpanOption currently supported is WithTimestamp which will set the
-// end time for a Span's life-cycle.
+// The only SpanEndOption currently supported are [trace.WithTimestamp], and
+// [trace.WithStackTrace].
 //
 // If this method is called while panicking an error event is added to the
 // Span before ending it and the panic is continued.

trace/config.go

@@ -213,7 +213,7 @@ var _ SpanStartEventOption = attributeOption{}
 
 // WithAttributes adds the attributes related to a span life-cycle event.
 // These attributes are used to describe the work a Span represents when this
-// option is provided to a Span's start or end events. Otherwise, these
+// option is provided to a Span's start event. Otherwise, these
 // attributes provide additional information about the event being recorded
 // (e.g. error, state change, processing progress, system event).
 //