Improve the module description given by log_cache_tags_help()

The current description given in log_cache_tags_help() is the following one.

Enable and turn on to log all cache tags to queue table for collection and review.

Enable and turn on both means enable the module. It is more exact to say install the module, but that is not necessary, as that is a step required for all the modules, to be able to use them. Furthermore, without installing the module, the output of log_cache_tags_help() would not be visible.

log all cache tags to queue table is not correct: Logs are not stored in the queue table. With the default logger, they are stored in a database table, but it is not necessary to say that; log is sufficient.

log all cache tags is not correct either: What the module logs are the invalidated cache tags, not all the cache tags.