Revert "DOC: temporary remove pyarrow example of reading subset columns (#18661)

[jorisvandenbossche]

This reverts commit 695e893.

Closes #18628 (reverts #18661)

[codecov]

Codecov Report

Merging #26194 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26194      +/-   ##
==========================================
- Coverage   91.98%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52370    52370              
==========================================
- Hits        48174    48170       -4     
- Misses       4196     4200       +4

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.71% <ø> (-0.15%)	⬇️

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

---

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[codecov]

Codecov Report

Merging #26194 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26194      +/-   ##
==========================================
- Coverage   91.98%   91.98%   -0.01%     
==========================================
  Files         175      175              
  Lines       52370    52370              
==========================================
- Hits        48174    48170       -4     
- Misses       4196     4200       +4

Flag	Coverage Δ
#multiple	90.53% <ø> (ø)	⬆️
#single	40.71% <ø> (-0.15%)	⬇️

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

---

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 b9e46ad...3315161. Read the comment docs.

[jreback]

thanks @jorisvandenbossche