Merge pull request rails#43743 from martinjaimem/update-documentation-many-any

Update documentation #any? #many? [ci-skip]

Author: jonathanhefner

guides/source/active_record_querying.md

@@ -2178,12 +2178,16 @@ You can also use `any?` and `many?` to check for existence on a model or relatio
 
 ```ruby
 # via a model
-Order.any?   # => SELECT 1 AS one FROM orders
-Order.many?  # => SELECT COUNT(*) FROM orders
+Order.any?
+# => SELECT 1 FROM orders LIMIT 1
+Order.many?
+# => SELECT COUNT(*) FROM (SELECT 1 FROM orders LIMIT 2)
 
 # via a named scope
-Order.shipped.any?   # => SELECT 1 AS one FROM orders WHERE orders.status = 0
-Order.shipped.many?  # => SELECT COUNT(*) FROM orders WHERE orders.status = 0
+Order.shipped.any?
+# => SELECT 1 FROM orders WHERE orders.status = 0 LIMIT 1
+Order.shipped.many?
+# => SELECT COUNT(*) FROM (SELECT 1 FROM orders WHERE orders.status = 0 LIMIT 2)
 
 # via a relation
 Book.where(out_of_print: true).any?