DOC removed unnecessary use of parameter in example rename function call

[KatemaNL]

removed unnecessary (and misleading) use of index parameter in docstring example function call of rename function

xref #26248

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

[codecov]

Codecov Report

Merging #26250 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26250      +/-   ##
==========================================
- Coverage   91.98%   91.97%   -0.01%     
==========================================
  Files         175      175              
  Lines       52384    52384              
==========================================
- Hits        48184    48180       -4     
- Misses       4200     4204       +4

Flag	Coverage Δ
#multiple	90.52% <ø> (ø)	⬆️
#single	40.72% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/core/frame.py	96.9% <ø> (-0.12%)	⬇️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️

---

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[codecov]

Codecov Report

Merging #26250 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26250      +/-   ##
==========================================
- Coverage   91.98%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52384    52374      -10     
==========================================
- Hits        48184    48174      -10     
  Misses       4200     4200

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.72% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/core/frame.py	96.9% <ø> (-0.12%)	⬇️
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/base.py	97.98% <0%> (-0.22%)	⬇️
pandas/io/excel/_util.py	87.32% <0%> (-0.18%)	⬇️
pandas/util/testing.py	90.61% <0%> (-0.11%)	⬇️
pandas/core/reshape/pivot.py	96.52% <0%> (-0.02%)	⬇️
pandas/core/indexes/range.py	97.96% <0%> (-0.01%)	⬇️
pandas/io/pytables.py	90.22% <0%> (-0.01%)	⬇️
pandas/core/strings.py	98.86% <0%> (ø)	⬆️
... and 8 more

---

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Powered by Codecov. Last update 7eff627...6484086. Read the comment docs.

[pep8speaks]

Hello @KatemaNL! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2019-05-06 17:25:08 UTC

[jreback]

lgtm. @mroeschke

[mroeschke]

Thanks @KatemaNL