DOCSP-33850 Fixes typo in deleteMany example (#5150)

Author: kennethdyer

source/reference/method/db.collection.deleteMany.txt

@@ -235,7 +235,7 @@ Given a three member replica set, the following operation specifies a
    try {
       db.orders.deleteMany(
           { "client" : "Crude Traders Inc." },
-          { w : "majority", wtimeout : 100 }
+          { writeConcern: { w : "majority", wtimeout : 100 }}
       );
    } catch (e) {
       print (e);