Add NATS v2.11 requirement notes for TTL-related features (#751)

Updated XML comments and remarks to specify that TTL and delete marker features require NATS server v2.11 or later. This ensures clarity on version-specific functionality for developers.

src/NATS.Client.JetStream/Models/StreamConfig.cs

@@ -242,13 +242,15 @@ internal StreamConfig()
     /// <summary>
     /// AllowMsgTTL allows header initiated per-message TTLs. If disabled, then the `NATS-TTL` header will be ignored.
     /// </summary>
+    /// <remarks>This feature is only available on NATS server v2.11 and later.</remarks>
     [System.Text.Json.Serialization.JsonPropertyName("allow_msg_ttl")]
     [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingDefault)]
     public bool AllowMsgTTL { get; set; }
 
     /// <summary>
     /// Enables and sets a duration for adding server markers for delete, purge and max age limits.
     /// </summary>
+    /// <remarks>This feature is only available on NATS server v2.11 and later.</remarks>
     [System.Text.Json.Serialization.JsonPropertyName("subject_delete_marker_ttl")]
     [System.Text.Json.Serialization.JsonIgnore(Condition = System.Text.Json.Serialization.JsonIgnoreCondition.WhenWritingDefault)]
     [System.Text.Json.Serialization.JsonConverter(typeof(NatsJSJsonNanosecondsConverter))]

src/NATS.Client.KeyValueStore/INatsKVStore.cs

@@ -57,7 +57,7 @@ public interface INatsKVStore
     /// </summary>
     /// <param name="key">Key of the entry</param>
     /// <param name="value">Value of the entry</param>
-    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant.</param>
+    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant. This feature is only available on NATS server v2.11 and later.</param>
     /// <param name="serializer">Serializer to use for the message type.</param>
     /// <param name="cancellationToken">A <see cref="CancellationToken"/> used to cancel the API call.</param>
     /// <typeparam name="T">Serialized value type</typeparam>
@@ -83,7 +83,7 @@ public interface INatsKVStore
     /// </summary>
     /// <param name="key">Key of the entry</param>
     /// <param name="value">Value of the entry</param>
-    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant.</param>
+    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant. This feature is only available on NATS server v2.11 and later.</param>
     /// <param name="serializer">Serializer to use for the message type.</param>
     /// <param name="cancellationToken">A <see cref="CancellationToken"/> used to cancel the API call.</param>
     /// <typeparam name="T">Serialized value type</typeparam>
@@ -109,7 +109,7 @@ public interface INatsKVStore
     /// </summary>
     /// <param name="key">Key of the entry</param>
     /// <param name="value">Value of the entry</param>
-    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant.</param>
+    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant. This feature is only available on NATS server v2.11 and later.</param>
     /// <param name="serializer">Serializer to use for the message type.</param>
     /// <param name="cancellationToken">A <see cref="CancellationToken"/> used to cancel the API call.</param>
     /// <typeparam name="T">Serialized value type</typeparam>
@@ -137,7 +137,7 @@ public interface INatsKVStore
     /// <param name="key">Key of the entry</param>
     /// <param name="value">Value of the entry</param>
     /// <param name="revision">Last revision number to match</param>
-    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant.</param>
+    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant. This feature is only available on NATS server v2.11 and later.</param>
     /// <param name="serializer">Serializer to use for the message type.</param>
     /// <param name="cancellationToken">A <see cref="CancellationToken"/> used to cancel the API call.</param>
     /// <typeparam name="T">Serialized value type</typeparam>
@@ -165,7 +165,7 @@ public interface INatsKVStore
     /// <param name="key">Key of the entry</param>
     /// <param name="value">Value of the entry</param>
     /// <param name="revision">Last revision number to match</param>
-    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant.</param>
+    /// <param name="ttl">Time to live for the entry (requires the <see cref="NatsKVConfig.AllowMsgTTL"/> to be set to true). For a key that should never expire, use the <see cref="TimeSpan.MaxValue"/> constant. This feature is only available on NATS server v2.11 and later.</param>
     /// <param name="serializer">Serializer to use for the message type.</param>
     /// <param name="cancellationToken">A <see cref="CancellationToken"/> used to cancel the API call.</param>
     /// <typeparam name="T">Serialized value type</typeparam>

src/NATS.Client.KeyValueStore/NatsKVConfig.cs

@@ -81,11 +81,13 @@ public record NatsKVConfig
     /// <summary>
     /// If true, the bucket will allow TTL on individual keys.
     /// </summary>
+    /// <remarks>This feature is only available on NATS server v2.11 and later.</remarks>
     public bool AllowMsgTTL { get; set; }
 
     /// <summary>
     /// Enables and sets a duration for adding server markers for delete, purge and max age limits.
     /// </summary>
+    /// <remarks>This feature is only available on NATS server v2.11 and later.</remarks>
     public TimeSpan SubjectDeleteMarkerTTL { get; set; }
 }