[Notifier][FakeSMS] Update schema and take a mailer service id

Author: JamesHemery

notifier.rst

@@ -58,7 +58,7 @@ Service     Package                           DSN
 ==========  ================================  ====================================================
 AllMySms    ``symfony/allmysms-notifier``     ``allmysms://LOGIN:APIKEY@default?from=FROM``
 Esendex     ``symfony/esendex-notifier``      ``esendex://USER_NAME:PASSWORD@default?accountreference=ACCOUNT_REFERENCE&from=FROM``
-FakeSms     ``symfony/fake-sms-notifier``     ``fakesms://email?to=TO&from=FROM``
+FakeSms     ``symfony/fake-sms-notifier``     ``fakesms+email://MAILER_SERVICE_ID?to=TO&from=FROM``
 FreeMobile  ``symfony/free-mobile-notifier``  ``freemobile://LOGIN:PASSWORD@default?phone=PHONE``
 GatewayApi  ``symfony/gatewayapi-notifier``   ``gatewayapi://TOKEN@default?from=FROM``
 Infobip     ``symfony/infobip-notifier``      ``infobip://AUTH_TOKEN@HOST?from=FROM``