Update Elasticsearch image version in Synology docs

Update ES reference image in the Synology docs - covers issue found in https://discord.com/channels/920056098122248193/1457419960396808476/1457425454729400381 that was identified.

Author: lamusmaser

mkdocs/docs/installation/synology.md

@@ -4,7 +4,7 @@
 !!! danger "Compatibility Problems"
 	- As Synology is running their old kernel (currently 4.4.302+), you might face problems running Elasticsearch on your device, as newer Elasticsearch version require kernel modules not available and not backported by Synology.
 	- You will see errors like: `seccomp unavailable` and `CONFIG_SECCOMP not compiled into kernel`, `CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER are needed`.
-	- Workaround is to pin the Elasticsearch image to an older version, not requiring these modules: `docker.elastic.co/elasticsearch/elasticsearch:8.14.3`.
+	- Workaround is to pin the Elasticsearch image to an older version, not requiring these modules: `elasticsearch:8.14.3`.
 	- That is likely going to break in the future, as this project develops, new functionality might depend on new ES versions.
 
 !!! warning "Outdated"
@@ -278,4 +278,4 @@ When a new version of the image is available, you can use the following steps to
 
 ### Support
 
-If you're still having trouble, join us on [discord](https://www.tubearchivist.com/discord) and come to the [#support channel.](https://discord.com/channels/920056098122248193/1006394050217246772)
+If you're still having trouble, join us on [discord](https://www.tubearchivist.com/discord) and come to the [#support channel.](https://discord.com/channels/920056098122248193/1006394050217246772)