Documentation updates for Autodiscovery for Elastic Agent

[gizas]

The basic link for Elastic Agent Autodiscovery is https://www.elastic.co/guide/en/fleet/master/elastic-agent-kubernetes-autodiscovery.html and it includes two sublinks:

• https://www.elastic.co/guide/en/fleet/master/conditions-based-autodiscover.html
• https://www.elastic.co/guide/en/fleet/master/hints-annotations-autodiscovery.html

This story will introduce general guidelines and best practises for users to choose between conditions or hints scenario.
In more details:

• Introduce default values in conditions autodiscovery. Write an example with default values
• Write a block for default condition if no matches are applied
• Refer to variable substitution that is referred here: https://www.elastic.co/guide/en/fleet/current/dynamic-input-configuration.html
• Write troubleshooting examples for conditions and hints to verify why pods logs/metrics dont appear for suers

Tasks

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1. Hintsbest practises ingest-docs#392
   backport-8.10 backport-8.9 +2