Replace the [...] syntax from why3doc by a Markdown-like syntax.
Some why3doc comments in the gallery contains "[i,j[", which breaks the documentation since it opens a code block that is never closed. The proper way to write it is "[\[i,j\", which is not only ugly but also error-prone. This commit introduces a Markdown-like syntax for embedded code. It uses the backtick as a delimiter: "`[i,j[`". It also supports multi-backticks: "you can delimit code using `` `...` ``".
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