[pgadmin-org/pgadmin4] 3c5213: Update release note.

[Akshay Joshi]

  Branch: refs/heads/master
  Home:   https://github.com/pgadmin-org/pgadmin4
  Commit: 3c52139ce528f13407036193d6bc9b32de1a334b
      
https://github.com/pgadmin-org/pgadmin4/commit/3c52139ce528f13407036193d6bc9b32de1a334b
  Author: Akshay Joshi <akshay.jo...@enterprisedb.com>
  Date:   2022-10-12 (Wed, 12 Oct 2022)

  Changed paths:
    M docs/en_US/release_notes_6_15.rst

  Log Message:
  -----------
  Update release note.