Merge pull request #3695 from luixxiul/fix

Update docs/container-images.md: replace URLs

docs/container-images.md

@@ -9,7 +9,7 @@ We try to stick to official images (provided by their respective projects) as mu
 
 These services are enabled and used by default, but you can turn them off, if you wish.
 
-- [matrixdotorg/synapse](https://hub.docker.com/r/matrixdotorg/synapse/) - the official [Synapse](https://github.com/element-hq/synapse) Matrix homeserver (optional)
+- [element-hq/synapse](https://ghcr.io/element-hq/synapse) - a fork of [matrixdotorg/synapse](https://github.com/matrix-org/synapse) Matrix homeserver
 
 - [coturn/coturn](https://hub.docker.com/r/coturn/coturn/) - the [Coturn](https://github.com/coturn/coturn) STUN/TURN server (optional)
 
@@ -66,7 +66,7 @@ These services are not part of our default installation, but can be enabled by [
 
 - [matrix-org/matrix-appservice-discord](https://ghcr.io/matrix-org/matrix-appservice-discord) - the [matrix-appservice-discord](https://github.com/matrix-org/matrix-appservice-discord) bridge to [Discord](https://discordapp.com/) (optional)
 
-- [cadair/matrix-appservice-slack](https://hub.docker.com/r/cadair/matrix-appservice-slack) - the [matrix-appservice-slack](https://github.com/matrix-org/matrix-appservice-slack) bridge to [Slack](https://slack.com/) (optional)
+- [matrixdotorg/matrix-appservice-slack](https://hub.docker.com/r/matrixdotorg/matrix-appservice-slack) - the [matrix-appservice-slack](https://github.com/matrix-org/matrix-appservice-slack) bridge to [Slack](https://slack.com/) (optional)
 
 - [turt2live/matrix-appservice-webhooks](https://hub.docker.com/r/turt2live/matrix-appservice-webhooks) - the [Appservice Webhooks](https://github.com/turt2live/matrix-appservice-webhooks) bridge (optional)