DOC: removed versionadded <0.17 in doc strings

[topper-123]

Cleaned up old references to when functionality was added.

See also #17442, #17442, #17404.

[jreback]

lgtm. ping on green.

[topper-123]

It's green, I think? The failure doesn't seem to have anything to do with my pull request, right?

Is it possible to run that single test again without running the whole test suite? Alternative, should I push some irrelevant change, to see it the error happens again?

[gfyoung]

@topper-123 : Just ping us regarding unrelated failures, and we'll take care of it for you.

[codecov]

Codecov Report

Merging #17504 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #17504      +/-   ##
==========================================
- Coverage   91.18%   91.16%   -0.02%     
==========================================
  Files         163      163              
  Lines       49543    49543              
==========================================
- Hits        45177    45168       -9     
- Misses       4366     4375       +9

Flag	Coverage Δ
#multiple	88.95% <ø> (ø)	⬆️
#single	40.21% <ø> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/core/sparse/series.py	95.09% <ø> (ø)	⬆️
pandas/core/frame.py	97.77% <ø> (-0.1%)	⬇️
pandas/core/indexes/datetimes.py	95.52% <ø> (ø)	⬆️
pandas/core/reshape/reshape.py	99.29% <ø> (ø)	⬆️
pandas/core/indexes/category.py	98.54% <ø> (ø)	⬆️
pandas/core/strings.py	98.46% <ø> (ø)	⬆️
pandas/core/generic.py	91.98% <ø> (ø)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[codecov]

Codecov Report

Merging #17504 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #17504      +/-   ##
==========================================
- Coverage   91.18%   91.16%   -0.02%     
==========================================
  Files         163      163              
  Lines       49543    49543              
==========================================
- Hits        45177    45168       -9     
- Misses       4366     4375       +9

Flag	Coverage Δ
#multiple	88.95% <ø> (ø)	⬆️
#single	40.21% <ø> (-0.07%)	⬇️

Impacted Files	Coverage Δ
pandas/core/indexes/datetimes.py	95.52% <ø> (ø)	⬆️
pandas/core/sparse/series.py	95.09% <ø> (ø)	⬆️
pandas/core/frame.py	97.77% <ø> (-0.1%)	⬇️
pandas/core/generic.py	91.98% <ø> (ø)	⬆️
pandas/core/strings.py	98.46% <ø> (ø)	⬆️
pandas/core/reshape/reshape.py	99.29% <ø> (ø)	⬆️
pandas/core/indexes/category.py	98.54% <ø> (ø)	⬆️
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️

---

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 83436af...7cb1a4a. Read the comment docs.

[gfyoung]

@topper-123 @jreback : Everything is green and good to go now.

[jreback]

thanks!