Update instrumentation/spring/spring-boot-autoconfigure/src/main/java…

…/io/opentelemetry/instrumentation/spring/autoconfigure/exporters/internal/ExporterConfigEvaluator.java

instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/exporters/internal/ExporterConfigEvaluator.java

@@ -23,6 +23,7 @@ private ExporterConfigEvaluator() {}
   public static boolean isExporterEnabled(
       Environment environment, String exportersKey, String wantExporter, boolean defaultValue) {
 
+    // all Spring auto-configurations are disabled with otel.sdk.disabled
     if (environment.getProperty("otel.sdk.disabled", Boolean.class, false)) {
       return false;
     }