[integrations] Document "ignore_autodiscovery_tags" option

[davidor]

What does this PR do?

Documents the ignore_autodiscovery_tags option that was introduced here: DataDog/datadog-agent#4521

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• Review the changed files.
• Review the URLs listed in the Preview section.
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[github-actions]

Preview links (active after the build_preview check completes):
https://docs-staging.datadoghq.com/davidor/ignore_autodiscovery_tags/getting_started/integrations/

[kayayarai]

I suggested a little rewording, but also: With a name like ignore_autodiscovery_tags, I'd have expected true to be the setting that would stop the tags from coming through. No?

[kayayarai]

Suggested change

	By default, the metrics reported by integrations include tags autodiscovered from the environment. For example, the metrics reported by a Redis check that runs inside a container include tags that refer to the container like `image_name`. This can be disabled by setting the `ignore_autodiscovery_tags` parameter to `false`:
	By default, the metrics reported by integrations include tags autodiscovered from the environment. For example, the metrics reported by a Redis check that runs inside a container include tags that refer to the container, such as `image_name`. You can turn this behavior off by setting the `ignore_autodiscovery_tags` parameter to `false`:

[davidor]

Sorry, as you mentioned, the setting should be set to true instead of false.
I fixed that and also included your suggestion.