Update machine-readable-ui.mdx (#34217)

Added "import" under values of "action" for "planned_change".

website/docs/internals/machine-readable-ui.mdx

@@ -146,7 +146,7 @@ At the end of a plan or before an apply, Terraform will emit a `planned_change`
 
 - `resource`: object describing the address of the resource to be changed; see [resource object](#resource-object) below for details
 - `previous_resource`: object describing the previous address of the resource, if this change includes a configuration-driven move
-- `action`: the action planned to be taken for the resource. Values: `noop`, `create`, `read`, `update`, `replace`, `delete`, `move`.
+- `action`: the action planned to be taken for the resource. Values: `noop`, `create`, `read`, `update`, `replace`, `delete`, `move`, `import`.
 - `reason`: an optional reason for the change, only used when the action is `replace` or `delete`. Values:
   - `tainted`: resource was marked as tainted
   - `requested`: user requested that the resource be replaced, for example via the `-replace` plan flag
@@ -926,4 +926,4 @@ Finally, the `planned` field contains any resources that were in the process of
   },
   "type": "test_interrupt"
 }
-```
+```