fix(NODE-4079): update per comments

Author: durran

src/collection.ts

@@ -1046,6 +1046,12 @@ export class Collection<TSchema extends Document = Document> {
    * Gets an estimate of the count of documents in a collection using collection metadata.
    * This will always run a count command on all server versions.
    *
+   * due to an oversight in versions 5.0.0-5.0.8 of MongoDB, the count command,
+   * which estimatedDocumentCount uses in its implementation, was not included in v1 of
+   * the Stable API, and so users of the Stable API with estimatedDocumentCount are
+   * recommended to upgrade their server version to 5.0.9+ or set apiStrict: false to avoid
+   * encountering errors.
+   *
    * @see {@link https://www.mongodb.com/docs/manual/reference/command/count/#behavior|Count: Behavior}
    * @param options - Optional settings for the command
    * @param callback - An optional callback, a Promise will be returned if none is provided

src/operations/estimated_document_count.ts

@@ -40,7 +40,7 @@ export class EstimatedDocumentCountOperation extends CommandOperation<number> {
     }
 
     super.executeCommand(server, session, cmd, (err, response) => {
-      if (err && (err as MongoServerError).code !== 26) {
+      if (err) {
         callback(err);
         return;
       }