DOC: Fix docstring examples for assert_frame_equal

[BryanCutler]

This fixes the formatting in docstring examples for pandas.util.testing.assert_frame_equal so they will be displayed correctly.

• closes DOC: Fix docstring for assert_frame_equal examples #26003

[codecov]

Codecov Report

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@@            Coverage Diff            @@
##             master   #26004   +/-   ##
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  Coverage          ?   91.81%           
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  Files             ?      175           
  Lines             ?    52551           
  Branches          ?        0           
=========================================
  Hits              ?    48252           
  Misses            ?     4299           
  Partials          ?        0

Flag	Coverage Δ
#multiple	90.38% <ø> (?)
#single	40.72% <ø> (?)

Impacted Files	Coverage Δ
pandas/util/testing.py	90.62% <ø> (ø)

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@181f972). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #26004   +/-   ##
=========================================
  Coverage          ?   91.81%           
=========================================
  Files             ?      175           
  Lines             ?    52551           
  Branches          ?        0           
=========================================
  Hits              ?    48252           
  Misses            ?     4299           
  Partials          ?        0

Flag	Coverage Δ
#multiple	90.38% <ø> (?)
#single	40.72% <ø> (?)

Impacted Files	Coverage Δ
pandas/util/testing.py	90.62% <ø> (ø)

---

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 181f972...0beaf13. Read the comment docs.

[WillAyd]

Thanks!