modified endpoint comment

Signed-off-by: Shephali Mittal <shephalm@amazon.com>

plugins/telemetry-otel/src/main/java/org/opensearch/telemetry/tracing/exporter/OtlpGrpcSpanExporterProvider.java

@@ -38,7 +38,7 @@ private OtlpGrpcSpanExporterProvider(OtlpGrpcSpanExporter exporter) {
     public static OtlpGrpcSpanExporterProvider create(Settings settings) {
         OtlpGrpcSpanExporter exporter;
         String endpoint = OTelTelemetrySettings.TRACER_SPAN_EXPORTER_ENDPOINT.get(settings);
-        // if endpoint is empty, do not set Endpoint
+        // if endpoint is empty, do not set Endpoint. The default endpoint is "http://localhost:4317"
         if (endpoint.isEmpty()) {
             exporter = OtlpGrpcSpanExporter.builder().build();
         } else {