Added doc content for variables inspector code change by Hugo (#30408)

* Created the Inspect variables topic.

* Check in changes.

* Added relrefs.

* Added Hugh's suggestion.

docs/sources/variables/manage-variable.md

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+title = "Manage variables"
+keywords = ["grafana", "templating", "documentation", "guide", "template", "variable"]
+aliases = ["/docs/grafana/latest/reference/templating"]
+weight = 120
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+
+# Manage variables
+
+The variables page lets you [add]({{< relref "variable-types/_index.md" >}}) variables and manage existing variables. It also allows you to [inspect]({{< relref "inspect-variable.md" >}}) variables and identify whether a variable is being referenced (or used) in other variables or dashboard.
+
+## Move
+
+You can move a variable up or down the list using the up and down arrows respectively.
+
+## Clone
+
+To clone a variable, click the clone icon from the set of icons on the right. This creates a copy of the variable with the name of the original variable prefixed with `copy_of_`.
+
+## Delete
+
+To delete a variable, click the trash icon from the set of icons on the right.