[llvm] LangRef: rint, nearbyint: mention that default rounding mode is assumed (PR #77191)

[Andy Kaylor via llvm-commits]

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@@ -15751,7 +15751,9 @@ Semantics:
 """"""""""
 
 This function returns the same values as the libm ``rint`` functions
-would, and handles error conditions in the same way.
+would, and handles error conditions in the same way. The rounding mode
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andykaylor wrote:

> > What do you intend by the "handles error conditions in the same way" part of this?
> 
> I didn't write this, it is existing text. I don't know or understand the intent of it.

Oh, sorry. I missed that this text was already there.

https://github.com/llvm/llvm-project/pull/77191