Merge pull request #48304 from palSagnik/main

Fix incorrect content type in API reference page

Author: k8s-ci-robot

content/en/docs/reference/using-api/api-concepts.md

@@ -172,7 +172,7 @@ For example:
 
    ```
    POST /api/v1/namespaces/test/pods
-   Content-Type: json
+   Content-Type: application/json
    Accept: application/json
    … JSON encoded Pod object
    ---