[Issue 15673] [dox] atan2 docs have broken formatting

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15673

--- Comment #2 from hsteoh at quickfur.ath.cx ---
You can see the intended formatting here:
https://dlang.org/phobos-prerelease/std_math#.atan2

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