Update spring-boot-admin repo in readme

Author: TimHess

spring-boot-admin/README.adoc

@@ -9,5 +9,5 @@ Image for SteeltoeOSS local development with https://github.com/codecentric/spri
 == Running
 
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-$ docker run --publish 9099:9099 steeltoeoss/spring-boot-admin
+$ docker run --publish 9099:9099 steeltoe.azurecr.io/spring-boot-admin
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