Update Automatic multi-line aggregation part in Advanced Log Collection Configurations

[daenypark]

What does this PR do? What is the motivation?

There are tons of customers asking how to add auto multi-line options in docker and kubernetes. The current content for docker and kubernetes is confusing because it mentioned to add options in datadog.yaml while docker and kubernetes need another approach.

Automatic multi-line detection uses a list of common regular expressions to attempt to match logs. If the built-in list is not sufficient, you can also add custom patterns in the datadog.yaml file with the DD_LOGS_CONFIG_AUTO_MULTI_LINE_EXTRA_PATTERNS environment variable.

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

I checked updated configuration with my Sandbox and confirmed it worked.

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/daenypark/change_auto_multiline/agent/logs/advanced_log_collection

[JacksonDavenport]

Some small recommendations, additionally were those go.mod & go.sum files accidentally committed? Would be good to revert those changes.