doc: move ERR_NAPI_TSFN_START/STOP_IDLE_LOOP to legacy errors

PR-URL: https://github.com/nodejs/node/pull/55248
Refs: https://github.com/nodejs/node/pull/17887
Refs: https://github.com/nodejs/node/pull/32997
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jake Yuesong Li <jake.yuesong@gmail.com>

doc/api/errors.md

@@ -2291,21 +2291,6 @@ function.
 An error occurred while attempting to retrieve the JavaScript `undefined`
 value.
 
-<a id="ERR_NAPI_TSFN_START_IDLE_LOOP"></a>
-
-### `ERR_NAPI_TSFN_START_IDLE_LOOP`
-
-On the main thread, values are removed from the queue associated with the
-thread-safe function in an idle loop. This error indicates that an error
-has occurred when attempting to start the loop.
-
-<a id="ERR_NAPI_TSFN_STOP_IDLE_LOOP"></a>
-
-### `ERR_NAPI_TSFN_STOP_IDLE_LOOP`
-
-Once no more items are left in the queue, the idle loop must be suspended. This
-error indicates that the idle loop has failed to stop.
-
 <a id="ERR_NOT_BUILDING_SNAPSHOT"></a>
 
 ### `ERR_NOT_BUILDING_SNAPSHOT`
@@ -3581,6 +3566,39 @@ removed: v10.0.0
 
 Used by the `Node-API` when `Constructor.prototype` is not an object.
 
+<a id="ERR_NAPI_TSFN_START_IDLE_LOOP"></a>
+
+### `ERR_NAPI_TSFN_START_IDLE_LOOP`
+
+<!-- YAML
+added:
+  - v10.6.0
+  - v8.16.0
+removed:
+  - v14.2.0
+  - v12.17.0
+-->
+
+On the main thread, values are removed from the queue associated with the
+thread-safe function in an idle loop. This error indicates that an error
+has occurred when attempting to start the loop.
+
+<a id="ERR_NAPI_TSFN_STOP_IDLE_LOOP"></a>
+
+### `ERR_NAPI_TSFN_STOP_IDLE_LOOP`
+
+<!-- YAML
+added:
+  - v10.6.0
+  - v8.16.0
+removed:
+  - v14.2.0
+  - v12.17.0
+-->
+
+Once no more items are left in the queue, the idle loop must be suspended. This
+error indicates that the idle loop has failed to stop.
+
 <a id="ERR_NO_LONGER_SUPPORTED"></a>
 
 ### `ERR_NO_LONGER_SUPPORTED`