fix validation errors and warnings

[mkuznyetsov]

What does this pull request change?

Address errors that happen during the build and validate stage:

asciidoctor: ERROR: next@docs::pdf$administration-guide.adoc: line 5995: discret sections do not support nested sections

For some reason, antora build incorrectly replaces [discrete] tag with [discret#administration-guide:creating-a-telemetry-plugin:::_creating_a_server_that_receives_eventse]. breaking apart the tag at the last character. For now, we could remove the heading, while the cause of this issue is still being determined

WARN (asciidoctor): callout list item index: expected 3, got 1
    file: /__w/che-docs/che-docs/modules/administration-guide/pages/configuring-network-policies.adoc:103
    source: /__w/che-docs/che-docs (branch: main <worktree>)

most of these warnings could be fixed by moving around admonition / delimiter blocks, removing + linebreaks

asciidoctor: WARNING: next@docs::pdf$administration-guide.adoc: line 2484: id assigned to block already in use: installing-che-locally

it appears that there are simply two same ids, that was fixed by changing one of them to match the title

What issues does this pull request fix or reference?

eclipse-che/che#23020

Specify the version of the product this pull request applies to

Pull Request checklist

The author and the reviewers validate the content of this pull request with the following checklist, in addition to the automated tests.

• Any procedure:
  • Successfully tested.
• Any page or link rename:
  • The page contains a redirection for the previous URL.
  • Propagate the URL change in:
    • Dashboard default branding data
• Builds on Eclipse Che hosted by Red Hat.
• the Validate language on files added or modified step reports no vale warnings.

[github-actions]

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[github-actions]

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[deerskindoll]

lgtm

[deerskindoll]

lgtm

[mkuznyetsov]

another fixup commit pushed to fix the remaining warning

[12:03:16.088] WARN (asciidoctor): no callout found for <1>
    file: /projects/modules/end-user-guide/pages/starting-a-workspace-from-a-raw-devfile-url.adoc:49
    source: /projects (branch: che-23020 <worktree>)