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Use correct header level (#1078)
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Sergey Zubkov
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@@ -19060,7 +19060,7 @@ Synchronizing `iostreams` with `printf-style` I/O can be costly.
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### <a name="Rio-endl"></a>SL.io.50: Avoid `endl`
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### Reason
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##### Reason
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The `endl` manipulator is mostly equivalent to `'\n'` and `"\n"`;
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as most commonly used it simply slows down output by doing redundant `flush()`s.
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