[PR #7154/283861dd backport][3.9] fixed error in ContentDisposition doc

[patchback]

This is a backport of PR #7154 as merged into master (283861d).

What do these changes do?

Fix small mistake in doc

Are there changes in behavior for the user?

No.

Related issue number

#7151

[codecov]

Codecov Report

Merging #7156 (6bc11ae) into 3.9 (e209dc0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              3.9    #7156   +/-   ##
=======================================
  Coverage   97.17%   97.17%           
=======================================
  Files         107      107           
  Lines       31346    31346           
  Branches     3989     3989           
=======================================
  Hits        30462    30462           
  Misses        667      667           
  Partials      217      217           

Flag	Coverage Δ
CI-GHA	97.07% <ø> (ø)
OS-Linux	96.75% <ø> (ø)
OS-Windows	94.33% <ø> (-0.01%)	⬇️
OS-macOS	96.30% <ø> (ø)
Py-3.10.9	96.79% <ø> (ø)
Py-3.11.0	95.20% <ø> (-0.01%)	⬇️
Py-3.7.15	96.55% <ø> (ø)
Py-3.7.9	94.19% <ø> (ø)
Py-3.8.10	94.11% <ø> (-0.01%)	⬇️
Py-3.8.15	96.45% <ø> (ø)
Py-3.9.13	94.11% <ø> (ø)
Py-3.9.16	96.47% <ø> (ø)
Py-pypy7.3.10	93.87% <ø> (ø)
VM-macos	96.30% <ø> (ø)
VM-ubuntu	96.75% <ø> (ø)
VM-windows	94.33% <ø> (-0.01%)	⬇️

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