Issue #3480732 by debrup, joachim, quietone: Incorrect & incomplete docs for CachePluginBase::cacheSetMaxAge().

Debrup Pramanikrequested to merge
issue/drupal-3480732:3480732 into 11.x

Issue #3480732 by debrup, joachim: Incorrect & incomplete docs for CachePluginBase::cacheSetMaxAge().

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