Update the Composing builds section in contributing.md

[hongshuai1994]

Update the Composing builds section in contributing.md discussions/6551

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: hongshuai1994 / name: HS.Zhang (25084b6, 6e789a8)
• ✅ login: jack-berg (a4bc84f)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.57%. Comparing base (7b85775) to head (a4bc84f).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6560      +/-   ##
============================================
- Coverage     90.59%   90.57%   -0.02%     
+ Complexity     6255     6254       -1     
============================================
  Files           689      689              
  Lines         18698    18698              
  Branches       1843     1843              
============================================
- Hits          16939    16936       -3     
- Misses         1201     1206       +5     
+ Partials        558      556       -2     

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