Update release docs

- Also synched up the API changes in openapi yml file
- Step 1 and 2 of the release process

Issue-ID: CPS-1662
Change-Id: I5b9485497a27a3dee8639faedfa9c1bd8ed3265e
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
4 files changed