Add experimental banner to table calculation function pages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: charliedowler

references/table-calculation-functions/pivot-functions.mdx

@@ -3,6 +3,12 @@ title: "Pivot functions"
 description: "Built-in functions for accessing values across pivot columns in your table calculations."
 ---
 
+<Info>
+  **Table calculation functions are an Experimental feature.**
+
+  These functions may change or be updated without notice as we iterate. See [feature maturity levels](/references/workspace/feature-maturity-levels) for details.
+</Info>
+
 Pivot functions let you work with values across pivot columns in your results table. When you pivot a dimension in Lightdash, the values of that dimension become separate columns — pivot functions give you a way to reference and aggregate across those columns.
 
 <Note>

references/table-calculation-functions/row-functions.mdx

@@ -3,6 +3,12 @@ title: "Row functions"
 description: "Built-in functions for accessing values from other rows in your table calculations."
 ---
 
+<Info>
+  **Table calculation functions are an Experimental feature.**
+
+  These functions may change or be updated without notice as we iterate. See [feature maturity levels](/references/workspace/feature-maturity-levels) for details.
+</Info>
+
 Row functions let you reference values from other rows without writing raw SQL window functions. They use the `${table.column}` syntax to reference fields in your results table.
 
 <Note>