[Issue 13901] Improvements to documentation

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13901

--- Comment #2 from Ferdinand Majerech <kiithsacmp at gmail.com> ---
Also, for constraints that are either very complex or common between different
templates, see: https://issues.dlang.org/show_bug.cgi?id=13863

And also: https://issues.dlang.org/show_bug.cgi?id=13676 
(to allow different styling for parts of signature and the constraint)

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