Moved those files from _partials out of the way. Should be completely removed when the current articles with the former partials included are checked.

modules/ROOT/partialsdelete/2delete-proc_modifying-existing-systemd-services.adoc

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+[#modifying-existing-systemd-services]
+= Modifying existing systemd services
+
+This example shows how to modify an existing service. Service modification are stored within `/etc/systemd/system`, in a single file or in a subdirectory named after the service. For example, this procedure modifies the `httpd` service.
+
+[discrete]
+== Prerequisites
+
+* You are logged in as a user with administrator-level permissions.
+
+* You have a configured `httpd` server running through _systemd_.
+
+[discrete]
+== Procedure
+
+. _Systemd_ services can be modified using the `systemctl edit` command.
++
+----
+# systemctl edit httpd.service
+----
++
+This creates an override file `/etc/systemd/system/httpd.service.d/override.conf` and opens it in your text editor. Anything you put into this file will be *added* to the existing service file.
+
+. Add your custom configuration. For example:
++
+----
+[Service]
+Restart=always
+RestartSec=30
+----
++
+To replace an option that can be set multiple times, it must cleared first, otherwise the override file will add the option a second time.
++
+----
+[Service]
+ExecStart=
+ExecStart=<new command>
+----
+
+. Save the file. _Systemd_ automatically loads the new service configuration.
+
+. Restart the `httpd` service:
++
+----
+# systemctl restart httpd
+----
+
+To completely replace (instead of just add to/modify) an existing service file, use `systemctl edit --full`, e.g.  `systemctl edit --full httpd.service`. This will create `/etc/systemctl/system/httpd.service`, which will be used instead of the existing service file.
+
+[discrete]
+== Related Information
+
+* See link:#common-service-parameters[Common service parameters] for more information about the parameters used in this procedure.