Fix incorrect _disconnect_raise docstring

[mohsinhaider]

Pull Request check-list

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• Does $ tox pass with this change (including linting)?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
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Description of change

Updates docstring for _disconnect_raise to correctly reflect code

[codecov-commenter]

Codecov Report

Base: 92.23% // Head: 92.21% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (cc92f06) compared to base (ed38e77).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2534      +/-   ##
==========================================
- Coverage   92.23%   92.21%   -0.02%     
==========================================
  Files         113      113              
  Lines       29388    29388              
==========================================
- Hits        27106    27101       -5     
- Misses       2282     2287       +5     

Impacted Files	Coverage Δ
redis/asyncio/client.py	92.51% <ø> (ø)
tests/test_cluster.py	96.79% <0.00%> (-0.23%)	⬇️
tests/test_asyncio/test_cluster.py	97.48% <0.00%> (-0.13%)	⬇️
tests/test_asyncio/test_pubsub.py	99.53% <0.00%> (+0.15%)	⬆️

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