[PR #8804/8156789a backport][3.11] docs: minor grammar fix in client_reference.rst

[patchback]

This is a backport of PR #8804 as merged into master (8156789).

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (8a2a890) to head (a8f17e9).
Report is 599 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #8857   +/-   ##
=======================================
  Coverage   97.70%   97.70%           
=======================================
  Files         108      108           
  Lines       34183    34183           
  Branches     4061     4061           
=======================================
  Hits        33398    33398           
  Misses        586      586           
  Partials      199      199           

Flag	Coverage Δ
CI-GHA	97.60% <ø> (ø)
OS-Linux	97.27% <ø> (ø)
OS-Windows	94.82% <ø> (ø)
OS-macOS	96.97% <ø> (+<0.01%)	⬆️
Py-3.10.11	97.05% <ø> (ø)
Py-3.10.14	96.98% <ø> (ø)
Py-3.11.9	97.22% <ø> (ø)
Py-3.12.4	94.62% <ø> (ø)
Py-3.12.5	97.01% <ø> (ø)
Py-3.9.13	96.95% <ø> (ø)
Py-3.9.19	96.89% <ø> (ø)
Py-pypy7.3.16	96.48% <ø> (ø)
VM-macos	96.97% <ø> (+<0.01%)	⬆️
VM-ubuntu	97.27% <ø> (ø)
VM-windows	94.82% <ø> (ø)

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