[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/canvas/index.md

@@ -160,3 +160,7 @@ If multiple elements use the same field name, and you want to control which elem
 1. Reference the new unique field alias to create the element and field override.
 
 {{< video-embed src="/media/docs/grafana/canvas-data-links-9-4-0.mp4" max-width="750px" caption="Data links demo" >}}
+
+## Value mappings
+
+{{< docs/shared lookup="visualizations/value-mappings-options.md" source="grafana" version="<GRAFANA_VERSION>" >}}