DOC: fix example with Timestamp/integer addition

[jorisvandenbossche]

Remaining warning that is being raised in the examples in the docs (the others are related to pyarrow).

[codecov]

Codecov Report

Merging #26467 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26467      +/-   ##
==========================================
- Coverage   91.74%   91.74%   -0.01%     
==========================================
  Files         174      174              
  Lines       50763    50763              
==========================================
- Hits        46575    46572       -3     
- Misses       4188     4191       +3

Flag	Coverage Δ
#multiple	90.25% <ø> (ø)	⬆️
#single	41.72% <ø> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.02% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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[codecov]

Codecov Report

Merging #26467 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26467      +/-   ##
==========================================
- Coverage   91.74%   91.74%   -0.01%     
==========================================
  Files         174      174              
  Lines       50763    50763              
==========================================
- Hits        46575    46572       -3     
- Misses       4188     4191       +3

Flag	Coverage Δ
#multiple	90.25% <ø> (ø)	⬆️
#single	41.72% <ø> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	78.94% <0%> (-10.53%)	⬇️
pandas/core/frame.py	97.02% <0%> (-0.12%)	⬇️
pandas/util/testing.py	90.7% <0%> (+0.1%)	⬆️

---

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 44d5498...72b5a13. Read the comment docs.