Revert "doc: deprecate process.nextTick"

This reverts commit f7ea68a.

Author: marco-ippolito

doc/api/deprecations.md

@@ -3569,22 +3569,6 @@ Calling `Hash` class directly with `Hash()` or `new Hash()` is
 deprecated due to being internals, not intended for public use.
 Please use the [`crypto.createHash()`][] method to create Hash instances.
 
-### DEP0180: `process.nextTick`
-
-<!-- YAML
-changes:
-  - version: REPLACEME
-    pr-url: https://github.com/nodejs/node/pull/51280
-    description: Documentation-only deprecation.
--->
-
-Type: Documentation-only
-
-The [`process.nextTick()`][] API is deprecated due to performance
-issues with async callbacks and unpredictable behavior
-in promise and async/await scenarios.
-Please use [`queueMicrotask()`][] instead.
-
 [NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
 [RFC 6066]: https://tools.ietf.org/html/rfc6066#section-3
 [RFC 8247 Section 2.4]: https://www.rfc-editor.org/rfc/rfc8247#section-2.4
@@ -3677,9 +3661,7 @@ Please use [`queueMicrotask()`][] instead.
 [`process.exitCode`]: process.md#processexitcode_1
 [`process.getActiveResourcesInfo()`]: process.md#processgetactiveresourcesinfo
 [`process.mainModule`]: process.md#processmainmodule
-[`process.nextTick()`]: process.md#processnexttickcallback-args
 [`punycode`]: punycode.md
-[`queueMicrotask()`]: globals.md#queuemicrotaskcallback
 [`readable.readableEnded`]: stream.md#readablereadableended
 [`request.abort()`]: http.md#requestabort
 [`request.connection`]: http.md#requestconnection

lib/internal/process/task_queues.js

@@ -98,13 +98,8 @@ function processTicksAndRejections() {
   setHasRejectionToWarn(false);
 }
 
-/**
- * `nextTick()` will not enqueue any callback when the process is about to
- * exit since the callback would not have a chance to be executed.
- * @deprecated since REPLACEME
- * @param {() => any} callback
- * @returns {void}
- */
+// `nextTick()` will not enqueue any callback when the process is about to
+// exit since the callback would not have a chance to be executed.
 function nextTick(callback) {
   validateFunction(callback, 'callback');