add a description of the return value that was missing [ci skip]
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@ -156,7 +156,7 @@ person.changed? # => false
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person.first_name = "First Name"
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person.first_name # => "First Name"
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# returns if any attribute has changed.
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# returns true if any of the attributes have unsaved changes, false otherwise.
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person.changed? # => true
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# returns a list of attributes that have changed before saving.
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