[Issue 18081] dlangspec.pdf: don't escape dollars in code examples

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18081

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
Also in macro code blocks:

https://imgur.com/a/lmj2Q

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