DOCSP-31268: Added missing bracket to code sample (mongodb#714)

(cherry picked from commit d989545)

Author: caitlindavey

source/fundamentals/gridfs.txt

@@ -115,7 +115,7 @@ following code snippet:
         pipe(bucket.openUploadStream('myFile', {
             chunkSizeBytes: 1048576,
             metadata: { field: 'myField', value: 'myValue' }
-        });
+        }));
 
 See the `openUploadStream() API documentation <{+api+}/GridFSBucket.html#openUploadStream>`__ for more information.