Add example of selecting object with keys

It is not very straight forward how to select objects by their attributes from an array. This example provides the basic use case of how to select some objects based key values.

docs/content/3.manual/manual.yml

@@ -708,6 +708,9 @@ sections:
           - program: 'map(select(. >= 2))'
             input: '[1,5,3,0,7]'
             output: ['[5,3,7]']
+          - program: '.[] | select(.id == "second")'
+            input: '[{"id": "first", "val": 1}, {"id": "second", "val": 2}]'
+            output: '{"id": "second", "val": 2}'
 
 
       - title: "`arrays`, `objects`, `iterables`, `booleans`, `numbers`, `strings`, `nulls`, `values`, `scalars`"