Improve documentation for assert_frame|series_equal #26101

[sandepp123]

• closes Improve documentation for assert_frame|series_equal #26101
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[codecov]

Codecov Report

Merging #26106 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #26106      +/-   ##
==========================================
+ Coverage   91.96%   91.97%   +0.01%     
==========================================
  Files         175      175              
  Lines       52405    52377      -28     
==========================================
- Hits        48192    48176      -16     
+ Misses       4213     4201      -12

Flag	Coverage Δ
#multiple	90.53% <ø> (+0.02%)	⬆️
#single	40.71% <ø> (-0.15%)	⬇️

Impacted Files	Coverage Δ
pandas/util/testing.py	90.61% <ø> (ø)	⬆️
pandas/util/_doctools.py	0% <0%> (-12%)	⬇️
pandas/io/gbq.py	78.94% <0%> (-8.56%)	⬇️
pandas/compat/__init__.py	92.15% <0%> (-0.3%)	⬇️
pandas/core/frame.py	96.9% <0%> (-0.12%)	⬇️
pandas/io/excel/_base.py	92.82% <0%> (-0.07%)	⬇️
pandas/core/arrays/interval.py	93.06% <0%> (-0.06%)	⬇️
pandas/tseries/holiday.py	93.17% <0%> (-0.04%)	⬇️
pandas/core/indexes/interval.py	95.22% <0%> (-0.03%)	⬇️
pandas/core/arrays/sparse.py	92.3% <0%> (ø)	⬆️
... and 13 more

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[WillAyd]

These belong as part of the description of check_less_precise

[jreback]

lgtm. @WillAyd

[WillAyd]

Thanks @sandepp123