DOCS: Update to add transform steps for canvas data links (#64770)

* Update to add transform steps for data links

https://github.com/grafana/grafana/pull/64456 was merged and I have one more edit

* style fixes

* Update docs/sources/panels-visualizations/visualizations/canvas/index.md

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

* empty commit to force linting

* ran prettier

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

docs/sources/panels-visualizations/visualizations/canvas/index.md

@@ -84,7 +84,7 @@ The inline editing toggle enables you to lock or unlock the canvas panel. When t
 
 ### Data links
 
-Canvas supports [data links](https://grafana.com/docs/grafana/latest/panels-visualizations/configure-data-links/). You can create a data link for a metric-value element and display it by following these steps:
+Canvas supports [data links](https://grafana.com/docs/grafana/latest/panels-visualizations/configure-data-links/). You can create a data link for a metric-value element and display it for all elements that use the field name by following these steps:
 
 1. Set an element to be tied to a field value.
 1. Turn off the inline editing toggle.
@@ -95,6 +95,13 @@ Canvas supports [data links](https://grafana.com/docs/grafana/latest/panels-visu
 1. Hover over the element to display the data link tooltip.
 1. Click on the element to be able to open the data link.
 
-If multiple elements use the same field, you can create a unique field name using the [add field from calculation transform](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#add-field-from-calculation). The alias you create in the transformation will appear as a field you can use with an element.
+If multiple elements use the same field name, and you want to control which elements display the data link, you can create a unique field name using the [add field from calculation transform](https://grafana.com/docs/grafana/latest/panels-visualizations/query-transform-data/transform-data/#add-field-from-calculation). The alias you create in the transformation will appear as a field you can use with an element.
+
+1. In the panel editor for the canvas panel, click the **Transform** tab.
+1. Select **Add field from calculation** from the list of transformations, or click **+ Add transformation** to display the list first.
+1. Choose **Reduce row** from the dropdown and click the field name that you want to use for the element.
+1. Select **All Values** from the **Calculation** dropdown.
+1. Add an alias for the field name.
+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" >}}