Added a callout

Author: pabel-rh

modules/observe/adoption-insights/proc-install-adoption-insights.adoc

@@ -14,7 +14,7 @@ For the {product} Adoption Insights plugin, you must manually install the plugin
 +
 [source,yaml]
 ----
-- package: oci://quay.io/_<your_rhdh_plugins_repo>_/adoption-insights:latest!red-hat-developer-hub-backstage-plugin-adoption-insights
+- package: oci://quay.io/_<your_rhdh_plugins_repo>_/adoption-insights:latest!red-hat-developer-hub-backstage-plugin-adoption-insights # <1>
   disabled: false
   pluginConfig:
     dynamicPlugins:
@@ -45,4 +45,5 @@ For the {product} Adoption Insights plugin, you must manually install the plugin
         red-hat-developer-hub.backstage-plugin-analytics-module-adoption-insights:
           apiFactories:
             - importName: AdoptionInsightsAnalyticsApiFactory
-----
+----
+<1> Replace the _<your_rhdh_plugins_repo>_ variable with the {product} plugins repository in which the image you want to use is present.