DOC: Fix misspelling in get_dummies docstring

[max-kov]

• closes #xxxx
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #26207 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26207      +/-   ##
==========================================
- Coverage   91.99%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52375    52375              
==========================================
- Hits        48180    48175       -5     
- Misses       4195     4200       +5

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.7% <ø> (-0.14%)	⬇️

Impacted Files	Coverage Δ
pandas/core/reshape/reshape.py	99.56% <ø> (ø)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.61% <0%> (-0.11%)	⬇️

---

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[codecov]

Codecov Report

Merging #26207 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26207      +/-   ##
==========================================
- Coverage   91.99%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52375    52375              
==========================================
- Hits        48180    48175       -5     
- Misses       4195     4200       +5

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.7% <ø> (-0.14%)	⬇️

Impacted Files	Coverage Δ
pandas/core/reshape/reshape.py	99.56% <ø> (ø)	⬆️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.61% <0%> (-0.11%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 33e05d7...03bd22a. Read the comment docs.

[WillAyd]

thanks @max-kov