update rustc cmdargs markdown section
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@ -93,7 +93,7 @@ This informs `rustc` of the name of your crate.
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<a id="option-edition"></a>
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## `--edition`: specify the edition to use
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This flag takes a value of `2015` or `2018`. The default is `2015`. More
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This flag takes a value of `2015`, `2018` or `2021`. The default is `2015`. More
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information about editions may be found in the [edition guide].
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[edition guide]: ../edition-guide/introduction.html
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