[v10.4.x] Docs: Add value mappings shared content (#88191)

Docs: Add value mappings shared content (#86996)

* Added value mappings shared file

* Fixed name of file

* Fixed list of visualizations using shared file

* Added shared file to visualizations

* Updated shared file and added to canvas

* Updated shared file intro text

* Removed future tense

(cherry picked from commit d5fde99c6d)

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

@@ -214,3 +214,7 @@ Set a **Soft min** or **soft max** option for better control of Y-axis limits. B
 You can set standard min/max options to define hard limits of the Y-axis. For more information, refer to [Standard options definitions](ref:standard-options-definitions).
 
 {{< docs/shared lookup="visualizations/multiple-y-axes.md" source="grafana" version="<GRAFANA_VERSION>" leveloffset="+2" >}}
+
+## Value mappings
+
+{{< docs/shared lookup="visualizations/value-mappings-options.md" source="grafana" version="<GRAFANA_VERSION>" >}}