Minor cleanups in commands/cluster.py

[enjoy-binbin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2094 (d7b1599) into master (20e4b87) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2094      +/-   ##
==========================================
- Coverage   91.22%   91.20%   -0.02%     
==========================================
  Files         100      100              
  Lines       21486    21486              
==========================================
- Hits        19601    19597       -4     
- Misses       1885     1889       +4     

Impacted Files	Coverage Δ
redis/commands/cluster.py	93.57% <0.00%> (ø)
redis/asyncio/connection.py	82.63% <0.00%> (-0.24%)	⬇️
tests/test_cluster.py	97.48% <0.00%> (-0.12%)	⬇️

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[chayim]

Thanks @enjoy-binbin for helping make the documentation even better!