Change of results for object_pairs and object_inner_pairs

As per bug:
https://issues.couchbase.com/browse/MB-20128

we need to document the change of results for object_pairs and object_inner_pairs.
Now the results are:
SELECT object_pairs(indexMap) FROM default limit 1;
has val in results instead of value for 4.6.
"results": [
{
"$1": [

{ "name": "key1", "val": "val1" }

,

{ "name": "key2", "val": "val2" }

]
}
],

In 4.5.1 it used to be:
"results": [
{
"$1": [

{ "name": "key1", "value": "val1" }

,

{ "name": "key2", "value": "val2" }

]
}
],

Same is true for object_inner_pairs.

Please make sure this is part of release notes where features changes are mentioned.