Documentation: correct Unraid widget allowed fields (#5908)

docs/widgets/authoring/getting-started.md

@@ -62,3 +62,4 @@ To ensure cohesiveness of various widgets, the following should be used as a gui
 - Minimize the number of API calls
 - Avoid the use of custom proxy unless absolutely necessary
 - Widgets should be 'read-only', as in they should not make write changes using the relevant tool's API. Homepage widgets are designed to surface information, not to be a (usually worse) replacement for the tool itself.
+- Widgets should not allow manually overriding the "refresh interval" setting, as misconfigured refresh intervals can easily lead to performance issues for users.

docs/widgets/services/unraid.md

@@ -14,7 +14,7 @@ The Unraid widget allows you to monitor the resources of an Unraid server.
 
 The widget can display metrics for selected Unraid pools. If using one of the "pool" fields, you must also add the pool name to the settings.
 
-**Allowed fields:** `["cpu","memoryPercent","memoryAvailable","memoryUsed","notifications","arrayFreeSpace","arrayUsedSpace","arrayUsedPercent","status","pool1UsedSpace","pool1FreeSpace","pool1UsedPercent","pool2UsedSpace","pool2FreeSpace","pool2UsedPercent","pool3UsedSpace","pool3FreeSpace","pool3UsedPercent","pool4UsedSpace","pool4FreeSpace","pool4UsedPercent"]`
+**Allowed fields:** `["cpu","memoryPercent","memoryAvailable","memoryUsed","notifications","arrayFree","arrayUsedSpace","arrayUsedPercent","status","pool1UsedSpace","pool1FreeSpace","pool1UsedPercent","pool2UsedSpace","pool2FreeSpace","pool2UsedPercent","pool3UsedSpace","pool3FreeSpace","pool3UsedPercent","pool4UsedSpace","pool4FreeSpace","pool4UsedPercent"]`
 
 ```yaml
 widget: