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

docs/sources/shared/visualizations/value-mappings-options.md

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+---
+title: Value mappings options
+comments: |
+  This file is used in the following visualizations: bar chart, bar gauge, candlestick, canvas, gauge, geomap, histogram, pie chart, stat, state timeline, status history, table, time series, trend
+---
+
+Value mapping is a technique you can use to change how data appears in a visualization.
+
+For each value mapping, set the following options:
+
+- **Condition** - Choose what's mapped to the display text and (optionally) color:
+  - **Value** - Specific values
+  - **Range** - Numerical ranges
+  - **Regex** - Regular expressions
+  - **Special** - Special values like `Null`, `NaN` (not a number), or boolean values like `true` and `false`
+- **Display text**
+- **Color** (Optional)
+- **Icon** (Canvas only)
+
+To learn more, refer to [Configure value mappings](../../configure-value-mappings/).