docs: Add a doc for NG5014

[JeanMeche]

Short explanation this help fix the Root node not found error.

I got the idea when I saw #50564.

[AndrewKushnir]

Caretaker note: low risk change, no extra reviews are required. We can also skip presubmit for this change. This PR is ready for merge (once CI is "green").

[pkozlowski-opensource]

@JeanMeche it looks like the test_aio failures are real as those don't go away after restart.

Could you PTAL?

[JeanMeche]

The aio tests are flaky, I'll try a rebase.

[github-actions[bot]]

Deployed aio for 3addb8ab38e9eaa0d2e5071fc9d659f9d456137a to: https://ng-dev-previews-fw--pr-angular-angular-50567-5fgmziv8.web.app

Note: As new commits are pushed to this pull request, this link is updated after the preview is rebuilt.

[pkozlowski-opensource]

@JeanMeche I've rebased this PR but still see the same aio tests jobs failing - so as unlikely as it sounds, it seems like there is something more than a flake going on. Going to remove the merge label for now, lmk if you need help debugging those tests.

[JeanMeche]

I not against some help yes.

I'm wondering if the issue is maybe related to #50537.

[AndrewKushnir]

This PR was merged into the repository by commit 0522f1b35355d4772f70fa941c7c566d84236316.

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