[FIX] fix spelling

[Remi-Gau]

• Closes Codespell update is catching new mistakes #4025

Changes proposed in this pull request:

• fix typos caught by codespell

[github-actions]

👋 @Remi-Gau Thanks for creating a PR!

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[codecov]

Codecov Report

Merging #4026 (7e6b62a) into main (9e5706d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4026   +/-   ##
=======================================
  Coverage   91.73%   91.73%           
=======================================
  Files         145      145           
  Lines       16230    16230           
  Branches     3367     3367           
=======================================
  Hits        14888    14888           
  Misses        797      797           
  Partials      545      545           

Flag	Coverage Δ
macos-latest_3.10	91.65% <ø> (ø)
macos-latest_3.11	91.65% <ø> (ø)
macos-latest_3.8	91.61% <ø> (ø)
macos-latest_3.9	91.61% <ø> (ø)
ubuntu-latest_3.10	91.65% <ø> (ø)
ubuntu-latest_3.11	91.65% <ø> (ø)
ubuntu-latest_3.8	91.61% <ø> (ø)
ubuntu-latest_3.9	91.61% <ø> (ø)
windows-latest_3.10	91.59% <ø> (ø)
windows-latest_3.11	91.59% <ø> (?)
windows-latest_3.8	91.55% <ø> (ø)
windows-latest_3.9	91.56% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
nilearn/_utils/exceptions.py	100.00% <ø> (ø)
nilearn/decoding/fista.py	85.18% <ø> (ø)
nilearn/decomposition/_base.py	94.87% <ø> (ø)
nilearn/glm/regression.py	78.43% <ø> (ø)

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[ymzayek]

Thx @Remi-Gau