feature #15178 [Notifier] [LightSMS] add docs (StaffNowa)

This PR was squashed before being merged into the 5.3-dev branch.

Discussion
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[Notifier] [LightSMS] add docs

LightSMS symfony/symfony#40607

Commits
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3fe341f [Notifier] [LightSMS] add docs

Author: OskarStark

notifier.rst

@@ -64,6 +64,7 @@ FreeMobile  ``symfony/free-mobile-notifier``  ``freemobile://LOGIN:PASSWORD@defa
 GatewayApi  ``symfony/gatewayapi-notifier``   ``gatewayapi://TOKEN@default?from=FROM``
 Infobip     ``symfony/infobip-notifier``      ``infobip://AUTH_TOKEN@HOST?from=FROM``
 Iqsms       ``symfony/iqsms-notifier``        ``iqsms://LOGIN:PASSWORD@default?from=FROM``
+LightSMS    ``symfony/lightsms-notifier``     ``lightsms://LOGIN:TOKEN@default?from=PHONE``
 Mobyt       ``symfony/mobyt-notifier``        ``mobyt://USER_KEY:ACCESS_TOKEN@default?from=FROM``
 Nexmo       ``symfony/nexmo-notifier``        ``nexmo://KEY:SECRET@default?from=FROM``
 Octopush    ``symfony/octopush-notifier``     ``octopush://USERLOGIN:APIKEY@default?from=FROM&type=TYPE``
@@ -85,7 +86,7 @@ Twilio      ``symfony/twilio-notifier``       ``twilio://SID:TOKEN@default?from=
 
 .. versionadded:: 5.3
 
-    The Iqsms, GatewayApi, Octopush, AllMySms, Clickatell, SpotHit and FakeSms
+    The Iqsms, GatewayApi, Octopush, AllMySms, Clickatell, SpotHit, FakeSms and LightSMS
     integrations were introduced in Symfony 5.3.
 
 To enable a texter, add the correct DSN in your ``.env`` file and