DOC: fix iloc column swap example in indexing guide (bounty #65446)

[bomlinux92-byte]

Summary

Fix for BOUNTY #65446 — DOC: Swapping values with iloc causes aligns axes, wrong example in docs

Root cause

The documentation example does NOT properly swap columns. Pandas aligns on column labels during assignment, even when using for selection. The result is that columns are assigned by label match rather than position, so the swap does not occur as expected.

Fix

Updated the documentation example to use to break the alignment:

This ensures the assignment is done positionally, achieving the expected column swap behavior.

Verification

Documentation now correctly shows that is required for positional column swapping with . The corrected example produces the expected output showing columns properly swapped.

Closes #65446