Documentation cleanup

[chayim]

Documentation fixes for warnings, to ensure we can link the various types of connections. Also fixes #1839

[codecov-commenter]

Codecov Report

Merging #1841 (1ef7985) into master (deaaa53) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1841      +/-   ##
==========================================
- Coverage   93.62%   93.60%   -0.02%     
==========================================
  Files          76       76              
  Lines       16207    16207              
==========================================
- Hits        15173    15171       -2     
- Misses       1034     1036       +2     

Impacted Files	Coverage Δ
redis/client.py	89.37% <ø> (ø)
redis/cluster.py	92.04% <ø> (ø)
redis/commands/graph/commands.py	84.50% <ø> (ø)
redis/commands/search/commands.py	88.46% <ø> (ø)
redis/connection.py	88.33% <ø> (ø)
redis/sentinel.py	85.98% <ø> (ø)
tests/test_cluster.py	98.40% <0.00%> (-0.13%)	⬇️

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