CLN: remove util._doctools._WritableDoc

[topper-123]

• xref CLN: remove PY2 #25725

Removes the metaclass _WritableDoc from the code base.

[jreback]

lgtm. ping on green.

[codecov]

Codecov Report

Merging #26164 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26164      +/-   ##
==========================================
- Coverage      92%   91.97%   -0.03%     
==========================================
  Files         175      175              
  Lines       52382    52374       -8     
==========================================
- Hits        48195    48173      -22     
- Misses       4187     4201      +14

Flag	Coverage Δ
#multiple	90.53% <ø> (-0.03%)	⬇️
#single	40.72% <ø> (-0.17%)	⬇️

Impacted Files	Coverage Δ
pandas/util/_doctools.py	0% <ø> (-12%)	⬇️
pandas/core/arrays/interval.py	93.06% <ø> (-0.06%)	⬇️
pandas/core/indexes/interval.py	95.22% <ø> (-0.03%)	⬇️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️

---

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[codecov]

Codecov Report

Merging #26164 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26164      +/-   ##
==========================================
- Coverage      92%   91.97%   -0.03%     
==========================================
  Files         175      175              
  Lines       52382    52374       -8     
==========================================
- Hits        48195    48173      -22     
- Misses       4187     4201      +14

Flag	Coverage Δ
#multiple	90.53% <ø> (-0.03%)	⬇️
#single	40.72% <ø> (-0.17%)	⬇️

Impacted Files	Coverage Δ
pandas/util/_doctools.py	0% <ø> (-12%)	⬇️
pandas/core/arrays/interval.py	93.06% <ø> (-0.06%)	⬇️
pandas/core/indexes/interval.py	95.22% <ø> (-0.03%)	⬇️
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
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 3e90d43...09a5065. Read the comment docs.

[topper-123]

Green.

[jreback]

thanks @topper-123