DOC: fix errors/warnings in running code blocks

[jorisvandenbossche]

Cleaning up errors / warnings in the doc build, related to the ipython code blocks:

• put a section about hdf5 and Panel in verbatim code blocks + added some :okwarning: for Panel (will need to be properly cleaned up when Panel is removed)
• fixed cases that raised deprecation warning for TimedeltaIndex.fillna() with integers
• reworded case that raised deprecation warning about passing integers + timezone to DatetimeIndex
• pd.core.config doesn't exist anymore -> removed that call + made the actual example verbatim

[codecov]

Codecov Report

Merging #26076 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26076      +/-   ##
==========================================
- Coverage   91.89%   91.89%   -0.01%     
==========================================
  Files         175      175              
  Lines       52509    52509              
==========================================
- Hits        48255    48251       -4     
- Misses       4254     4258       +4

Flag	Coverage Δ
#multiple	90.45% <ø> (ø)	⬆️
#single	40.74% <ø> (-0.14%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/core/frame.py	96.79% <0%> (-0.12%)	⬇️

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[codecov]

Codecov Report

Merging #26076 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26076      +/-   ##
==========================================
+ Coverage   91.89%   91.94%   +0.04%     
==========================================
  Files         175      175              
  Lines       52509    52427      -82     
==========================================
- Hits        48255    48204      -51     
+ Misses       4254     4223      -31

Flag	Coverage Δ
#multiple	90.5% <ø> (+0.05%)	⬆️
#single	40.73% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	75% <0%> (-12.5%)	⬇️
pandas/util/_doctools.py	12% <0%> (-0.88%)	⬇️
pandas/core/frame.py	96.79% <0%> (-0.13%)	⬇️
pandas/core/computation/ops.py	95.62% <0%> (-0.04%)	⬇️
pandas/core/computation/align.py	97.8% <0%> (-0.03%)	⬇️
pandas/core/reshape/melt.py	97.47% <0%> (-0.03%)	⬇️
pandas/plotting/_core.py	83.76% <0%> (-0.02%)	⬇️
pandas/util/testing.py	90.61% <0%> (-0.01%)	⬇️
pandas/core/sparse/frame.py	95.49% <0%> (-0.01%)	⬇️
pandas/core/sorting.py	98.29% <0%> (-0.01%)	⬇️
... and 35 more

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[jreback]

prob should change this to a code-block (good for followup though)

[jreback]

same

[jreback]

small comment. add Panel to code-blocks in 2 places or followup is ok.

[jorisvandenbossche]

small comment. add Panel to code-blocks in 2 places or followup is ok.

Yeah, we indeed need to convert those to actual code-blocks at some point. But there are still some other occurrences as well, so will leave that for a separate PR.