Note about sampled transactions in Discover (#8407)

* Note about sampled transactions in Discover

Added note to the Search section to explain that searches based on transaction data may be subject to sampling.

* Update src/docs/product/discover-queries/query-builder.mdx

* [getsentry/action-github-commit] Auto commit

* Update src/docs/product/discover-queries/query-builder.mdx

Co-authored-by: vivianyentran <[email protected]>

* [getsentry/action-github-commit] Auto commit

---------

Co-authored-by: getsantry[bot] <66042841+getsantry[bot]@users.noreply.github.com>
Co-authored-by: vivianyentran <[email protected]>

Author: 3 people

src/docs/product/discover-queries/query-builder.mdx

@@ -58,6 +58,13 @@ Click on any of these sections to further refine your search. For example, click
 
 ![Facet map for transaction and handled tags. Map looks like a bar with gradient colors.](./discover-facet-map.png)
 
+<Note>
+  When performing searches on transaction events, based on your search criteria
+  and sample rate, the events available may be limited because Discover uses
+  sampled data only. Learn more by reading about [retention
+  priorities](/product/performance/retention-priorities/).
+</Note>
+
 ## Filter by Interactive Graph
 
 Each query has a interactive graph that reflects the data presented in the table below. To zoom in, simply click and drag over the area you want to investigate. You can also customize the display and the Y-Axis. This will be saved with your query.