Issue #3631718: Clarify Views cache documentation

leandro vazquez cervantesrequested to merge
issue/drupal-3631718:3631718-document-views-cache into main

Clarifies the documentation in CachePluginBase to distinguish expiration of cached view results from the max-age of the rendered view.

Also documents how cache tags are used and clarifies that the results cache type is currently supported.

Closes #3631718

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