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Add explanation of benefits to prefer-output-null rule doc #124

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2 changes: 2 additions & 0 deletions docs/rules/prefer-output-null.md
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(fixable) The `--fix` option on the [command line](../user-guide/command-line-interface#fix) automatically fixes problems reported by this rule.

Instead of repeating the test case `code`, using `output: null` is more concise and makes it easier to distinguish whether a test case provides an autofix.

## Rule Details

The rule reports an error if it encounters a test case where the output is the same as the code.
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