Adds cat node -h values (#4771) (#4777)

* add cat shards -h values

* add cat thead_pool -h values

* Fix format

* Fix bulleted list

* Update specification/cat/_types/CatBase.ts



* Update specification/cat/thread_pool/CatThreadPoolRequest.ts



* Update specification/cat/thread_pool/CatThreadPoolRequest.ts



* fix typo

---------



(cherry picked from commit 3df6bb7)

Co-authored-by: Charlotte Hoblik <116336412+charlotte-hoblik@users.noreply.github.com>
Co-authored-by: lcawl <lcawley@elastic.co>
Co-authored-by: Quentin Pradet <quentin.pradet@elastic.co>

Author: 4 people