Docstring improvements for Redis class

[chayim]

closes #1442

[codecov-commenter]

Codecov Report

Merging #1675 (70046d2) into master (599f5a9) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1675      +/-   ##
==========================================
+ Coverage   89.69%   89.74%   +0.04%     
==========================================
  Files          57       57              
  Lines       11193    11193              
==========================================
+ Hits        10040    10045       +5     
+ Misses       1153     1148       -5     

Impacted Files	Coverage Δ
redis/client.py	87.76% <ø> (ø)
tests/test_search.py	98.61% <0.00%> (+0.76%)	⬆️

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