doc: do not advise to cancel full CI on onboarding

Refs: #21938 (comment)
and discussion below the comment.

PR-URL: #21977
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: João Reis <reis@janeasystems.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>

doc/onboarding.md

@@ -213,9 +213,7 @@ needs to be pointed out separately during the onboarding.
 * Optionally, include your personal pronouns.
 * Label your pull request with the `doc` and `notable-change` labels.
 * Run CI on the PR. Because the PR does not affect any code, use the
-  `node-test-pull-request-lite-pipeline` CI task. Alternatively, use the usual
-  `node-test-pull-request` CI task and cancel it after the linter and one other
-  subtask have passed.
+  `node-test-pull-request-lite-pipeline` CI task.
 * After one or two approvals, land the PR (PRs of this type do not need to wait
   for 48/72 hours to land).
   * Be sure to add the `PR-URL: <full-pr-url>` and appropriate `Reviewed-By:`