Clean up and add more of an explination

Author: jonathan-buttner

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/rest/ServerSentEventsRestActionListener.java

@@ -358,7 +358,6 @@ public ReleasableBytesReference encodeChunk(int sizeHint, Recycler<BytesRef> rec
                     target.write(ServerSentEventSpec.EOL);
                     target.write(ServerSentEventSpec.EOL);
                     target.flush();
-
                 }
                 final var result = new ReleasableBytesReference(chunkStream.bytes(), () -> Releasables.closeExpectNoException(chunkStream));
                 target = null;

x-pack/plugin/inference/src/test/java/org/elasticsearch/xpack/inference/services/openai/OpenAiServiceTests.java

@@ -922,7 +922,7 @@ public void testInfer_SendsRequest() throws IOException {
     }
 
     public void testUnifiedCompletionInfer() throws Exception {
-        // streaming response must be on a single line
+        // The escapes are because the streaming response must be on a single line
         String responseJson = """
             data: {\
                 "id":"12345",\