[pgadmin-org/pgadmin4] 5b0912: Update release notes.

[Akshay Joshi]

  Branch: refs/heads/master
  Home:   https://github.com/pgadmin-org/pgadmin4
  Commit: 5b0912267660d718ed32e04e7a893ea33f45ff96
      
https://github.com/pgadmin-org/pgadmin4/commit/5b0912267660d718ed32e04e7a893ea33f45ff96
  Author: Akshay Joshi <akshay.jo...@enterprisedb.com>
  Date:   2022-10-11 (Tue, 11 Oct 2022)

  Changed paths:
    M docs/en_US/release_notes_6_15.rst

  Log Message:
  -----------
  Update release notes.