docs: Update release process documentation with better templates

[abhi0324]

Ⅰ. Describe what this PR does

This PR enhances the release process documentation by:

1. Replacing placeholder "XXX" text with descriptive placeholders
2. Adding more detailed instructions in the release template

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how to verify it

1. Review the changes in RELEASE-PROCESS.md
2. Verify that:
   • All "XXX" placeholders have been replaced with meaningful text
   • The release template is more descriptive

Ⅳ. Special notes for reviews

• Documentation update only
• No code changes
• Improves clarity for maintainers

[kruise-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.78%. Comparing base (ff8dcec) to head (01bdf86).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2056   +/-   ##
=======================================
  Coverage   43.78%   43.78%           
=======================================
  Files         316      316           
  Lines       31617    31617           
=======================================
+ Hits        13842    13845    +3     
+ Misses      16378    16375    -3     
  Partials     1397     1397           

Flag	Coverage Δ
unittests	43.78% <ø> (+<0.01%)	⬆️

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