docs: alert rules update info (#7681)

* docs: testing alert rule link

added link to the device troubleshooting page.

* Update Rules.md

fix link

* Update Testing.md

fix link

* Update Rules.md

removed link - not useful for this part.

* image for alert rules collection

* image for alert rules collection

added image alert rules collection

doc/Alerting/Rules.md

@@ -65,8 +65,9 @@ Alert when:
 - High port usage, where description is not client & ifType is not softwareLoopback: `%macros.port_usage_perc >= "80" && %port.port_descr_type != "client" && %ports.ifType != "softwareLoopback"`
 - Alert when mac address is located on your network `%ipv4_mac.mac_address = "2c233a756912"`
 
+### Alert Rules Collection
+You can also select Alert Rule from the Alerts Collection. These Alert Rules are submitted by users in the community :)
+![Alert Rules Collection](/img/alert-rules-collection.png)
+
 ## Procedure
 You can associate a rule to a procedure by giving the URL of the procedure when creating the rule. Only links like "http://" are supported, otherwise an error will be returned. Once configured, procedure can be opened from the Alert widget through the "Open" button, which can be shown/hidden from the widget configuration box.
-
-## Check to see if your alert rule matches
-See [Device Troubleshooting](Support/Device-Troubleshooting.md)

doc/Alerting/Testing.md

@@ -29,3 +29,6 @@ As an example, if you wanted to test template ID 10 against localhost running ru
 
 If the rule is currently alerting for localhost then you will get the full template as expected to see on email, if it's not then you will just see the 
 template without any fault information.
+
+## Check to see if your alert rule matches
+ See [Device Troubleshooting](https://docs.librenms.org/#Support/Device-Troubleshooting/)