* doc/guix.texi (Monitoring Services): Document the various 'zabbix-*' service
types, and expand description of all Zabbix services. Use less marketing terms.
(Web Services): Add subsubheading for PHP-FPM, and anchors for
cross-referencing.
* gnu/services/monitoring.scm (zabbix-front-end-configuration): Use @ref
instead of @pxref for cross-referencing.
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