fix: minor grammar fix in queries module docs (#11233)

The heading is a question but is missing a question mark

docs/product/insights/queries.mdx

@@ -111,7 +111,7 @@ You can generate a new list of random sample events by clicking the "Try Differe
 
 From the sample list, you can drill down to specific good, average, or bad examples of a given query within a given endpoint. Click on an event ID to drill into the query's span details within the span waterfall of the [Trace View page](/concepts/key-terms/tracing/trace-view/).
 
-## What is Time Spent
+## What is Time Spent?
 
 By default, queries are sorted by **time spent**, which serves as a proxy for the relative impact of a given query.