[ci skip] Change core_ext cherry picking example. #42171
Merged
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Object#blank?
is used as an example in this guide of a core extensionthat is not loaded by default in Active Support, and how to load it
manually. However it now is loaded by default.
This change gives a different example (
Hash#with_indifferent_access
)that will hopefully be less likely to be pulled into the default
requires in future.
Fixes #42152