doc: move util.toUSVString() outside of deprecated group

Refs: https://github.com/nodejs/node/pull/39814/files#r693445849

PR-URL: #39840
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

doc/api/util.md

@@ -1308,6 +1308,17 @@ const { read, written } = encoder.encodeInto(src, dest);
 
 The encoding supported by the `TextEncoder` instance. Always set to `'utf-8'`.
 
+## `util.toUSVString(string)`
+<!-- YAML
+added: REPLACEME
+-->
+
+* `string` {string}
+
+Returns the `string` after replacing any surrogate code points
+(or equivalently, any unpaired surrogate code units) with the
+Unicode "replacement character" U+FFFD.
+
 ## `util.types`
 <!-- YAML
 added: v10.0.0
@@ -2468,18 +2479,6 @@ const util = require('util');
 util.log('Timestamped message.');
 ```
 
-
-### `util.toUSVString(string)`
-<!-- YAML
-added: REPLACEME
--->
-
-* `string` {string}
-
-Returns the `string` after replacing any surrogate code points
-(or equivalently, any unpaired surrogate code units) with the
-Unicode "replacement character" U+FFFD.
-
 [Common System Errors]: errors.md#errors_common_system_errors
 [Custom inspection functions on objects]: #util_custom_inspection_functions_on_objects
 [Custom promisified functions]: #util_custom_promisified_functions