[Issue 12536] Improve the documentation about preprocessing the files has "Ddoc" file header

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12536

berni44 <bugzilla at d-ecke.de> changed:

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--- Comment #4 from berni44 <bugzilla at d-ecke.de> ---
Actually I too do not understand what this is about...

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