[clang] [Clang][doc] -ffp-contract options and standard compliance (PR #127621)

[Erich Keane via cfe-commits]

================
@@ -1681,19 +1681,27 @@ for more details.
    permitted to produce more precise results than performing the same
    operations separately.
 
-   The C standard permits intermediate floating-point results within an
+   The C/C++ standard permits intermediate floating-point results within an
----------------
erichkeane wrote:

```suggestion
   The C/C++ standards permit intermediate floating-point results within an
```

https://github.com/llvm/llvm-project/pull/127621