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fix typo in macros-by-example.md
complete the missing parenthesis and move the parenthesis out of the code block into it.
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src/macros-by-example.md

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@@ -174,9 +174,9 @@ compiler knows how to expand them properly:
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2. Each repetition in the transcriber must contain at least one metavariable to
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decide how many times to expand it. If multiple metavariables appear in the
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same repetition, they must be bound to the same number of fragments. For
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instance, `( $( $i:ident ),* ; $( $j:ident ),* ) =>( $( ($i,$j) ),*` must
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instance, `( $( $i:ident ),* ; $( $j:ident ),* ) => ( $( ($i,$j) ),* )` must
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bind the same number of `$i` fragments as `$j` fragments. This means that
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invoking the macro with `(a, b, c; d, e, f`) is legal and expands to
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invoking the macro with `(a, b, c; d, e, f)` is legal and expands to
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`((a,d), (b,e), (c,f))`, but `(a, b, c; d, e)` is illegal because it does
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not have the same number. This requirement applies to every layer of nested
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repetitions.

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