(DOCSP-21585) Fix Key Vault Namespace (#220)

Author: biniona-mongodb

source/fundamentals/csfle.txt

@@ -147,7 +147,7 @@ The full source is available at
                }});
            }};
 
-           String keyVaultNamespace = "admin.datakeys";
+           String keyVaultNamespace = "encryption.__keyVault";
            ClientEncryptionSettings clientEncryptionSettings = ClientEncryptionSettings.builder()
                    .keyVaultMongoClientSettings(MongoClientSettings.builder()
                            .applyConnectionString(new ConnectionString("mongodb://localhost"))