[Clang][doc] -ffp-contract options and standard compliance

We had an internal discussion about -ffp-contract, how it compared to
GCC which defaults to fast, and standard compliance. Looking at our
docs, I think most information is there, but also thought it could be a
little bit more explicit about when it is and isn't standard compliant.
Let me know if you think this is an improvement or not; happy to abandon
this if you think it is not helping much.

Author: sjoerdmeijer

clang/docs/UsersManual.rst

@@ -1681,19 +1681,25 @@ 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
    expression to be computed with more precision than their type would
    normally allow. This permits operation fusing, and Clang takes advantage
-   of this by default. This behavior can be controlled with the ``FP_CONTRACT``
-   and ``clang fp contract`` pragmas. Please refer to the pragma documentation
-   for a description of how the pragmas interact with this option.
+   of this by default (``on``). Fusion across statements is non-C/C++ standard
+   compliant behavior and can be enabled (``fast``).
+
+   Fusion can be controlled with the ``FP_CONTRACT`` and ``clang fp contract``
+   pragmas. Please refer to the pragma documentation for a description of how
+   the pragmas interact with this option.
 
    Valid values are:
 
-   * ``fast`` (fuse across statements disregarding pragmas, default for CUDA)
-   * ``on`` (fuse in the same statement unless dictated by pragmas, default for languages other than CUDA/HIP)
-   * ``off`` (never fuse)
-   * ``fast-honor-pragmas`` (fuse across statements unless dictated by pragmas, default for HIP)
+   * ``fast``: enable non-C/C++ standard compliant behavior and fusion across
+     statements disregarding pragmas (default for CUDA)
+   * ``on``: enable C/C++ standard complaint fusion in the same statement unless
+     dictated by pragmas (default for languages other than CUDA/HIP)
+   * ``off``: disable fusion
+   * ``fast-honor-pragmas``: fuse across statements unless dictated by pragmas
+     (default for HIP)
 
 .. option:: -f[no-]honor-infinities