* fix typo

proto/opamp.proto

@@ -564,7 +564,7 @@ message AgentDescription {
     //   Agent type, e.g. "io.opentelemetry.collector"
     // - service.namespace if it is used in the environment where the Agent runs.
     // - service.version should be set to version number of the Agent build.
-    // - service.instance.id should be set. It may be be set equal to the Agent's
+    // - service.instance.id should be set. It may be set equal to the Agent's
     //   instance uid (equal to ServerToAgent.instance_uid field) or any other value
     //   that uniquely identifies the Agent in combination with other attributes.
     // - any other attributes that are necessary for uniquely identifying the Agent's