message: docs: add planned release schedule till v16
  Add release dates for v15.1,v15.2 and v16
  PR Close
diff: @@ -112,7 +112,9 @@ Dates are offered as general guidance and are subject to change.
  | Version | Date |
  | :--- | :--- |
  -| v15.0 | Week of 2022-11-18 |
  +| v15.1 | Week of 2022-01-09 |
  +| v15.2 | Week of 2022-02-20 |
  +| v16.0 | Week of 2022-05-01 |
  ### Support window
  