DOC: collective communication

[YibinLiu666]

What do these changes do?

Related issue number

Fixes #xxxx

Check code requirements

• tests added / passed (if needed)
• Ensure all linting tests pass

[codecov]

Codecov Report

Merging #68 (7c94da1) into main (2683f2e) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   89.00%   88.95%   -0.06%     
==========================================
  Files          47       47              
  Lines        3991     3991              
  Branches      760      760              
==========================================
- Hits         3552     3550       -2     
- Misses        356      357       +1     
- Partials       83       84       +1     

Flag	Coverage Δ
unittests	88.77% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
python/xoscar/collective/core.py	78.20% <ø> (ø)

... and 1 file with indirect coverage changes

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