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gh-110886 Doc: add a link to BNF Wikipedia article (#110887)

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Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
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Doc/reference/introduction.rst
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@ -90,7 +90,8 @@ Notation
.. index:: BNF, grammar, syntax, notation
The descriptions of lexical analysis and syntax use a modified BNF grammar
The descriptions of lexical analysis and syntax use a modified
`Backus–Naur form (BNF) <https://en.wikipedia.org/wiki/Backus%E2%80%93Naur_form>`_ grammar
notation. This uses the following style of definition:
.. productionlist:: notation