[ccm] anomalies - adding info about watchdog explains

[jonathankauch]

What does this PR do? What is the motivation?

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Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/jojo/ccm-update-anomalies-docs-with-watchdog-explains/cloud_cost_management/anomalies

[goeln]

There's a few parts where i think we can link to elsewhere in teh docs (ex: in take action, we reference resolve, so we can hyperlink to that section of these docs)

[rtrieu]

Some minor feedback for your review!