DOCS: put LIMIT 10 to the SQL query (#32065)

Provides a more precise equivalent SQL query for the aggregation example in the getting started guide.

docs/reference/getting-started.asciidoc

@@ -1122,7 +1122,7 @@ In SQL, the above aggregation is similar in concept to:
 
 [source,sh]
 --------------------------------------------------
-SELECT state, COUNT(*) FROM bank GROUP BY state ORDER BY COUNT(*) DESC
+SELECT state, COUNT(*) FROM bank GROUP BY state ORDER BY COUNT(*) DESC LIMIT 10;
 --------------------------------------------------
 
 And the response (partially shown):