[Issue 20272] Add standard section "Limitations" to ddoc

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20272

Seb <greeenify at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |greeenify at gmail.com

--- Comment #1 from Seb <greeenify at gmail.com> ---
Ddoc doesn't have pre-defined sections. It uses the colon to do so.

So as long as you write sth along:

Limitations:
   Your limitations here.

This will be displayed similarly to the other "sections".

Ddoc supports custom macros with which you could create a custom warning .
However, it doesn't look like we'll get custom warning boxes
(https://github.com/dlang/dlang.org/pull/2308).

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