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)
Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>
grafana-delivery-bot[bot]