[CHORE] Shorten one test comment to the voice of the surrounding file

Eight lines became five, with the notification argument and the reason the cases
hold the handoff rather than the parking both kept.

es_log_record_exporter_test passes 14 of 14 and clang-format 18.1.8 is clean.

Signed-off-by: thc1006 <84045975+thc1006@users.noreply.github.com>

Author: thc1006

exporters/elasticsearch/test/es_log_record_exporter_test.cc

@@ -440,14 +440,11 @@ std::shared_ptr<ParkedExport> StartParkedExport()
 }
 }  // namespace
 
-// A terminal error that arrives after the handler has been handed off, while the export is still
-// running, has to end the wait, which is the half the notification is responsible for. Without
-// these two, removing cv_.notify_all() keeps this file green.
-//
-// The handoff is what they hold, not the parking: the session publishes the handler before
-// SendRequest() returns, so the export need not have reached cv_.wait() when the callback is
-// delivered. Holding that would want a wait entry seam in production code, which is not worth the
-// API it would add.
+// A terminal error that arrives after the handler is handed off, while the export is still
+// running, has to end the wait. Without these two, removing cv_.notify_all() keeps this file
+// green. What they hold is the handoff rather than the parking: the session publishes the handler
+// before SendRequest() returns, so the export need not have reached cv_.wait() yet. Holding that
+// would want a wait-entry seam in production code, which is not worth the API.
 TEST_F(ElasticsearchLogsExporterSyncTests, AReadErrorAfterTheHandoffEndsTheExport)
 {
   auto parked = StartParkedExport();