Fix broken link for update checker docs in mdk (#9271)

mdk/src/main/resources/META-INF/mods.toml

@@ -22,7 +22,7 @@ modId="examplemod" #mandatory
 version="${file.jarVersion}" #mandatory
  # A display name for the mod
 displayName="Example Mod" #mandatory
-# A URL to query for updates for this mod. See the JSON update specification https://mcforge.readthedocs.io/en/latest/gettingstarted/autoupdate/
+# A URL to query for updates for this mod. See the JSON update specification https://docs.minecraftforge.net/en/latest/misc/updatechecker/
 #updateJSONURL="https://change.me.example.invalid/updates.json" #optional
 # A URL for the "homepage" for this mod, displayed in the mod UI
 #displayURL="https://change.me.to.your.mods.homepage.example.invalid/" #optional