docs: add release flow docs

[Fatman13]

Related Issues

fix #4990

related to ipfs-force-community/dev-guidances#35

Proposed Changes

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• All commits have a clear commit message.
• The PR title is in the form of of <PR type>: <#issue number> <area>: <change being made>
  • example: fix: #1234 mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, INTERFACE BREAKING CHANGE, CONSENSUS BREAKING, build, chore, ci, docs, misc, perf, refactor, revert, style, test
  • area: venus, venus-messager, venus-miner, venus-gateway, venus-auth, venus-market, venus-sealer, venus-wallet, venus-cluster, api, chain, state, vm, data transfer, mempool, message, block production, multisig, networking, paychan, proving, sealing, wallet
• This PR has tests for new functionality or change in behaviour
• If new user-facing features are introduced, clear usage guidelines and / or documentation updates should be included in venus docs or Discussion Tutorials.
• CI is green

[codecov-commenter]

Codecov Report

Merging #4991 (514f2fc) into master (5367fa7) will increase coverage by 0%.
The diff coverage is n/a.

❗ Current head 514f2fc differs from pull request most recent head 9d548b0. Consider uploading reports for the commit 9d548b0 to get more accurate results

@@          Coverage Diff           @@
##           master   #4991   +/-   ##
======================================
  Coverage      25%     25%           
======================================
  Files         597     597           
  Lines       64991   64991           
======================================
+ Hits        16567   16568    +1     
+ Misses      46261   46257    -4     
- Partials     2163    2166    +3     

[diwufeiwen]

假如发了vX.Y.Z后又有修复，也许需要考虑怎么办，这种情况有发生的可能

[diwufeiwen]

LGTM