Update agent/common-problems.md

[stefnestor]

Cross-link Agent diag to its CLI diag counterpart.

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[bmorelli25]

Thank you! A few thoughts:

• Even though we're already in the Elastic Agent docs, we should use the full name, "Elastic Agent" to distinguish between Elastic Agent and APM Agents.
• Because the page you're linking to is in the same repo, you should use one of our two internal link syntaxes.
• I would change the link to be the name of the command to give more context as to where the user is being linked off to.

Suggested change

	Run the following [Agent command](https://www.elastic.co/docs/reference/fleet/agent-command-reference#elastic-agent-diagnostics-command) to generate a zip archive containing diagnostics information that the Elastic team can use for debugging cases.
	Run the [`diagnostics` command](/reference/fleet/agent-command-reference#elastic-agent-diagnostics-command) to generate a zip archive containing diagnostics information that the Elastic team can use for debugging cases:

[stefnestor]

Thanks, @bmorelli25 ! (And the link to know how to do this myself in the future!)

Your change doesn't pass pipeline:

FWIW I need the sub-# not just the base file. I may be missing the obvious, but I don't see cross-page anchors listed in your linked guide.

[bmorelli25]

Your change doesn't pass pipeline:

Sorry! See comment below.

I may be missing the obvious, but I don't see cross-page anchors listed in your linked guide.

This is good feedback. It is not obvious in the docs that you can do this with internal links. There is (kind of) an example wayyy down the page but it's in a different section. Let me add a better example into these docs.

[bmorelli25]

Clarified in elastic/docs-builder#1447

[bmorelli25]

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