fix: typo

Author: phamhieu

config/clients/js/template/README_calling_api.mustache

@@ -341,8 +341,8 @@ const response = await fgaClient.deleteTuples(tuples, options);
   - `OnDuplicateWrites.Ignore`: Treats duplicate writes as no-ops, allowing idempotent write operations
 
 - **`onMissingDeletes`**:
-  - `onMissingDeletes.Error` (default): Returns an error when attempting to delete a tuple that doesn't exist
-  - `onMissingDeletes.Ignore`: Treats deletes of non-existent tuples as no-ops, allowing idempotent delete operations
+  - `OnMissingDeletes.Error` (default): Returns an error when attempting to delete a tuple that doesn't exist
+  - `OnMissingDeletes.Ignore`: Treats deletes of non-existent tuples as no-ops, allowing idempotent delete operations
 
 > **Important**: If a Write request contains both idempotent (ignore) and non-idempotent (error) operations, the most restrictive action (error) will take precedence. If a condition fails for a sub-request with an error flag, the entire transaction will be rolled back.