Make nsType optional in ChangeStreamDocument (#1759)

Author: baileympearson

source/change-streams/change-streams.md

@@ -128,7 +128,7 @@ class ChangeStreamDocument {
    * 
    * @since 8.1.0
    */
-  nsType: "collection" | "timeseries" | "view" | null;
+  nsType: Optional<"collection" | "timeseries" | "view">;
 
   /**
    * Only present for ops of type 'rename'.
@@ -1016,6 +1016,8 @@ There should be no backwards compatibility concerns.
 
 ## Changelog
 
+- 2025-02-24: Make `nsType` `Optional` to match other optional fields in the change stream spec.
+
 - 2025-01-29: Add `nsType` to `ChangeStreamDocument`.
 
 - 2024-02-09: Migrated from reStructuredText to Markdown.