fix typo in containers documentation (#40309)

* fix typo in containers documentation

* Update doc/JSON_INFO.md

Co-authored-by: ZhilkinSerg <ZhilkinSerg@users.noreply.github.com>

Co-authored-by: Curtis Merrill <curtis.r.merrill@gmail.com>
Co-authored-by: ZhilkinSerg <ZhilkinSerg@users.noreply.github.com>

doc/JSON_INFO.md

@@ -1881,7 +1881,7 @@ CBMs can be defined like this:
 Any Item can be a container. To add the ability to contain things to an item, you need to add pocket_data. The below example is a typical container (shown with optional default values, or mandatory if the value is mandatory)
 
 ```C++
-"pocket_type": [ 
+"pocket_data": [
   {
     "pocket_type": "CONTAINER",               // the typical container pocket. pockets can also be MAGAZINE
     "min_item_volume": "0 ml",                // the minimum volume of item that can be placed into this pocket