Remove duplicate "Legend values" heading (#75614)

* Remove second "Legend values" heading

I'm not honestly sure if this is the correct choice but there are two "Legend values" in the current document because the shared page "visualizations/legend-mode.md" has that heading.

I'm assuming because of the use of the shared page, that the information there is preferred.

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>

* Prefer alternative text

Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

---------

Signed-off-by: Jack Baldry <jack.baldry@grafana.com>
Co-authored-by: Isabel <76437239+imatwawana@users.noreply.github.com>

docs/sources/panels-visualizations/visualizations/pie-chart/index.md

@@ -79,8 +79,6 @@ The following example shows a pie chart with **Name** and **Percent** labels dis
 
 {{< docs/shared lookup="visualizations/tooltip-mode.md" source="grafana" version="<GRAFANA VERSION>" >}}
 
-{{< docs/shared lookup="visualizations/legend-mode.md" source="grafana" version="<GRAFANA VERSION>" >}}
-
 ### Legend values
 
 Select values to display in the legend. You can select more than one.
@@ -88,7 +86,7 @@ Select values to display in the legend. You can select more than one.
 - **Percent:** The percentage of the whole.
 - **Value:** The raw numerical value.
 
-For more information about the legend, refer to [Configure a legend](../configure-legend/).
+For more information about the legend, refer to [Configure a legend]{{< relref "../../configure-legend" >}}).
 
 {{% docs/reference %}}
 [Calculation types]: "/docs/grafana/ -> /docs/grafana/<GRAFANA VERSION>/panels-visualizations/calculation-types"