feat(discover): Add interval option docs (#5610)

- This adds interval option as a section in the query builder

Author: wmak

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

@@ -66,6 +66,10 @@ Click on any of these sections to further refine your search. For example, click
 
 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.
 
+### Interval Options
+
+The "Interval" selector allows you to change the date groupings in the graph. The selector has limits that are based on the currently selected time range. This means, for example, if you're querying over 90 days, the largest interval you can select is 45 days and the smallest is one hour.
+
 ### Display Options
 
 - Total Period