Fix k8s docs

docs/plugins/k8s_metadata_decorator.md

@@ -9,7 +9,7 @@ The `k8s_metadata_decorator` plugin adds labels and annotations to the entry usi
 | `id`              | required    | A unique identifier for the plugin                                                              |
 | `output`          | required    | The connected plugin(s) that will receive all outbound entries                                  |
 | `namespace_field` | `namespace` | A [field](/docs/types/field.md) that contains the k8s namespace associated with the log entry   |
-| `pod_name`        | `pod_name`  | A [field](/docs/types/field.md) that contains the k8s pod name associated with the log entry    |
+| `pod_name_field`        | `pod_name`  | A [field](/docs/types/field.md) that contains the k8s pod name associated with the log entry    |
 | `cache_ttl`       | 10m         | A [duration](/docs/types/duration.md) indicating the time it takes for a cached entry to expire |
 
 ### Example Configurations