Fix inconsistent usage of 'results' and 'records' in read-json.md

[dagardner-nv]

Description

• Fix inconsistent usage of 'results' and 'records' in docs/cudf/source/user_guide/io/read-json.md

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.

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[bdice]

/ok to test

[vyasr]

/merge

[vyasr]

/ok to test

[vyasr]

/merge