Fix Geo Nodes API example json response

doc/api/geo_nodes.md

@@ -307,37 +307,37 @@ Example response:
     "health_status": "Healthy",
     "missing_oauth_application": false,
     "attachments_count": 1,
-    "attachments_synced_count": nil,
-    "attachments_failed_count": nil,
+    "attachments_synced_count": null,
+    "attachments_failed_count": null,
     "attachments_synced_missing_on_primary_count": 0,
     "attachments_synced_in_percentage": "0.00%",
-    "db_replication_lag_seconds": nil,
+    "db_replication_lag_seconds": null,
     "lfs_objects_count": 0,
-    "lfs_objects_synced_count": nil,
-    "lfs_objects_failed_count": nil,
+    "lfs_objects_synced_count": null,
+    "lfs_objects_failed_count": null,
     "lfs_objects_synced_missing_on_primary_count": 0,
     "lfs_objects_synced_in_percentage": "0.00%",
     "job_artifacts_count": 2,
-    "job_artifacts_synced_count": nil,
-    "job_artifacts_failed_count": nil,
+    "job_artifacts_synced_count": null,
+    "job_artifacts_failed_count": null,
     "job_artifacts_synced_missing_on_primary_count": 0,
     "job_artifacts_synced_in_percentage": "0.00%",
     "container_repositories_count": 3,
-    "container_repositories_synced_count": nil,
-    "container_repositories_failed_count": nil,
+    "container_repositories_synced_count": null,
+    "container_repositories_failed_count": null,
     "container_repositories_synced_in_percentage": "0.00%",
     "design_repositories_count": 3,
-    "design_repositories_synced_count": nil,
-    "design_repositories_failed_count": nil,
+    "design_repositories_synced_count": null,
+    "design_repositories_failed_count": null,
     "design_repositories_synced_in_percentage": "0.00%",
     "projects_count": 41,
     "repositories_count": 41,
-    "repositories_failed_count": nil,
-    "repositories_synced_count": nil,
+    "repositories_failed_count": null,
+    "repositories_synced_count": null,
     "repositories_synced_in_percentage": "0.00%",
     "wikis_count": 41,
-    "wikis_failed_count": nil,
-    "wikis_synced_count": nil,
+    "wikis_failed_count": null,
+    "wikis_synced_count": null,
     "wikis_synced_in_percentage": "0.00%",
     "replication_slots_count": 1,
     "replication_slots_used_count": 1,
@@ -367,7 +367,7 @@ Example response:
     "repositories_checked_in_percentage": "17.07%",
     "last_event_id": 23,
     "last_event_timestamp": 1509681166,
-    "cursor_last_event_id": nil,
+    "cursor_last_event_id": null,
     "cursor_last_event_timestamp": 0,
     "last_successful_status_check_timestamp": 1510125024,
     "version": "10.3.0",
@@ -408,12 +408,12 @@ Example response:
     "job_artifacts_synced_missing_on_primary_count": 0,
     "job_artifacts_synced_in_percentage": "50.00%",
     "container_repositories_count": 3,
-    "container_repositories_synced_count": nil,
-    "container_repositories_failed_count": nil,
+    "container_repositories_synced_count": null,
+    "container_repositories_failed_count": null,
     "container_repositories_synced_in_percentage": "0.00%",
     "design_repositories_count": 3,
-    "design_repositories_synced_count": nil,
-    "design_repositories_failed_count": nil,
+    "design_repositories_synced_count": null,
+    "design_repositories_failed_count": null,
     "design_repositories_synced_in_percentage": "0.00%",
     "projects_count": 41,
     "repositories_count": 41,
@@ -424,10 +424,10 @@ Example response:
     "wikis_failed_count": 0,
     "wikis_synced_count": 41,
     "wikis_synced_in_percentage": "100.00%",
-    "replication_slots_count": nil,
-    "replication_slots_used_count": nil,
+    "replication_slots_count": null,
+    "replication_slots_used_count": null,
     "replication_slots_used_in_percentage": "0.00%",
-    "replication_slots_max_retained_wal_bytes": nil,
+    "replication_slots_max_retained_wal_bytes": null,
     "repositories_checksummed_count": 20,
     "repositories_checksum_failed_count": 5,
     "repositories_checksummed_in_percentage": "48.78%",
@@ -518,12 +518,12 @@ Example response:
   "job_artifacts_synced_missing_on_primary_count": 0,
   "job_artifacts_synced_in_percentage": "50.00%",
   "container_repositories_count": 3,
-  "container_repositories_synced_count": nil,
-  "container_repositories_failed_count": nil,
+  "container_repositories_synced_count": null,
+  "container_repositories_failed_count": null,
   "container_repositories_synced_in_percentage": "0.00%",
   "design_repositories_count": 3,
-  "design_repositories_synced_count": nil,
-  "design_repositories_failed_count": nil,
+  "design_repositories_synced_count": null,
+  "design_repositories_failed_count": null,
   "design_repositories_synced_in_percentage": "0.00%",
   "projects_count": 41,
   "repositories_count": 41,
@@ -534,10 +534,10 @@ Example response:
   "wikis_failed_count": 0,
   "wikis_synced_count": 41,
   "wikis_synced_in_percentage": "100.00%",
-  "replication_slots_count": nil,
-  "replication_slots_used_count": nil,
+  "replication_slots_count": null,
+  "replication_slots_used_count": null,
   "replication_slots_used_in_percentage": "0.00%",
-  "replication_slots_max_retained_wal_bytes": nil,
+  "replication_slots_max_retained_wal_bytes": null,
   "last_event_id": 23,
   "last_event_timestamp": 1509681166,
   "cursor_last_event_id": 23,