Fixes #27095 : Removing registrytoken field from doc as it is deprecated by identitytoken field

Signed-off-by: milindchawre <milindchawre@gmail.com>

docs/reference/api/docker_remote_api_v1.23.md

@@ -1786,7 +1786,7 @@ a base64-encoded AuthConfig object.
 
         ```
     {
-            "registrytoken": "9cbaf023786cd7..."
+            "identitytoken": "9cbaf023786cd7..."
     }
         ```
 

docs/reference/api/docker_remote_api_v1.24.md

@@ -1787,7 +1787,7 @@ a base64-encoded AuthConfig object.
 
         ```
     {
-            "registrytoken": "9cbaf023786cd7..."
+            "identitytoken": "9cbaf023786cd7..."
     }
         ```
 

docs/reference/api/docker_remote_api_v1.25.md

@@ -1858,7 +1858,7 @@ a base64-encoded AuthConfig object.
 
         ```
     {
-            "registrytoken": "9cbaf023786cd7..."
+            "identitytoken": "9cbaf023786cd7..."
     }
         ```