Merge pull request #6908 from apricote/book-logs-json-import

📖 mention json register import for --logging-format=json

Author: k8s-ci-robot

docs/book/src/developer/providers/v1.1-to-v1.2.md

@@ -149,6 +149,12 @@ NOTES:
       <summary>View <code>main.go</code> diff</summary>
 
       ```diff
+      import (
+        ...
+      + "k8s.io/component-base/logs"
+      + _ "k8s.io/component-base/logs/json/register"
+      )
+
       var (
       	...
       +	logOptions = logs.NewOptions()