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Write all variables italic in section "About this document" (#25797)
Makes more sense. One variable was already written italic.
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@@ -34,10 +34,10 @@ To learn how to compile Nim programs and generate documentation see
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the [Compiler User Guide](nimc.html) and the [DocGen Tools Guide](docgen.html).
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The language constructs are explained using an extended BNF, in which `(a)*`
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means 0 or more `a`'s, `a+` means 1 or more `a`'s, and `(a)?` means an
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means 0 or more *a*'s, `a+` means 1 or more *a*'s, and `(a)?` means an
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optional *a*. Parentheses may be used to group elements.
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`&` is the lookahead operator; `&a` means that an `a` is expected but
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`&` is the lookahead operator; `&a` means that an *a* is expected but
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not consumed. It will be consumed in the following rule.
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The `|`, `/` symbols are used to mark alternatives and have the lowest
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