Variables: Add deprecation warning for value group tags (#30160)

* Variables: Add deprecation warning for value group tags

* Removed style changes, moving to seprate PR

* Update docs/sources/variables/variable-value-tags.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Update docs/sources/variables/variable-value-tags.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

docs/sources/variables/variable-selection-options.md

 +++
-title = "Enter variable Selection Options"
+title = "Variable selection options"
 weight = 400
 +++
 
-# Enter variable selection options
+# Configure variable selection options
 
 **Selection Options** are a feature you can use to manage variable option selections. All selection options are optional, and they are off by default.
 

docs/sources/variables/variable-value-tags.md

 +++
-title = "Enter Value tags"
+title = "Variable value group tags"
 weight = 500
 +++
 
-# Enter variable value groups/tags (experimental feature)
+# Configure variable value group tags 
+
+> **Note:** This is an experimental feature that will be deprecated in Grafana v8.
 
 Value groups/tags are a feature you can use to organize variable options. If you have many options in the dropdown for a multi-value variable, then you can use this feature to group the values into selectable tags.
 

public/app/features/variables/query/QueryVariableEditor.tsx

@@ -231,7 +231,9 @@ export class QueryVariableEditorUnConnected extends PureComponent<Props, State>
           />
 
           <VerticalGroup spacing="none">
-            <h5>Value groups/tags (Experimental feature)</h5>
+            <h5>Value group tags</h5>
+            <em className="muted p-b-1">Experimental feature, will be deprecated in Grafana v8.</em>
+
             <VariableSwitchField
               value={this.props.variable.useTags}
               name="Enabled"