docs(telemetry): add missing config options to xrpld-example.cfg

Document service_instance_id, use_tls, tls_ca_cert, batch_size,
batch_delay_ms, and max_queue_size in the [telemetry] section.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cfg/xrpld-example.cfg

@@ -1619,12 +1619,28 @@ validators.txt
 #   The node's network ID (from [network_id]) is automatically added
 #   as the `xrpl.network.id` and `xrpl.network.type` resource attributes.
 #
+# service_instance_id=<node_public_key>
+#
+#   OTel resource attribute `service.instance.id`. Uniquely identifies
+#   this node. Default: the node's public key (auto-detected).
+#
 # endpoint=http://localhost:4318/v1/traces
 #
 #   The OTLP/HTTP exporter endpoint. The server sends trace data as
 #   protobuf-encoded HTTP POST requests to this URL.
 #   Default: http://localhost:4318/v1/traces.
 #
+# --- TLS settings for the OTLP exporter connection ---
+#
+# use_tls=0
+#
+#   Enable TLS for the OTLP/HTTP exporter connection. Default: 0 (off).
+#
+# tls_ca_cert=
+#
+#   Path to a PEM-encoded CA certificate bundle for TLS verification.
+#   Only used when use_tls=1. Default: empty (system CA store).
+#
 # sampling_ratio=1.0
 #
 #   Head-based sampling ratio using TraceIdRatioBasedSampler. The decision
@@ -1660,3 +1676,19 @@ validators.txt
 #   Enable tracing for ledger close and accept operations — ledger
 #   building, state hashing, and write-back to the node store. Default: 1.
 #
+# --- Batch processor tuning ---
+#
+# batch_size=512
+#
+#   Maximum number of spans exported in a single batch. Default: 512.
+#
+# batch_delay_ms=5000
+#
+#   Maximum delay (milliseconds) before a partial batch is flushed.
+#   Default: 5000 (5 seconds).
+#
+# max_queue_size=2048
+#
+#   Maximum number of spans queued in memory before drops occur.
+#   Default: 2048.
+#