Remove sort example from simple query language (236) (#804)

The `sort=id:desc` example doesn't fit the "equality comparison for a logical property".

It also leads to confusion on how to indicate how the result should be sorted (rule 137 says `sort=-id`).

This replaces it with another "logical property", the age (which is often calculated from the birthday and current date).

chapters/http-requests.adoc

@@ -541,7 +541,7 @@ The following examples should serve as ideas for simple query language:
 
 * `name=Zalando`, `creation_year=2023`, `updated_by=user1` (query elements
   based on property equality)
-* `created_at=2023-09-18T12:12:00.000Z`, `sort=id:desc` (query elements
+* `created_at=2023-09-18T12:12:00.000Z`, `age=18` (query elements
   based on logical properties)
 * `color=red,green,blue,multicolored` (query elements based on multiple
   choice possibility)