Remove commented-out docs

- Also add a note for build system authors to use `clang++` options

Author: sharadhr

clang/docs/StandardCPlusPlusModules.rst

@@ -403,7 +403,10 @@ clang-cl
 
 ``clang-cl`` supports the same options as ``clang++`` for modules as detailed above;
 there is no need to prefix these options with ``/clang:``. Note that ``cl.exe``
-options to emit `IFC files <https://devblogs.microsoft.com/cppblog/using-cpp-modules-in-msvc-from-the-command-line-part-1/>` are *not* supported. The precompiled modules are also not compatible for use with ``cl.exe``.
+`options to emit/consume IFC files <https://devblogs.microsoft.com/cppblog/using-cpp-modules-in-msvc-from-the-command-line-part-1/>` are *not* supported.
+The resultant precompiled modules are also not compatible for use with ``cl.exe``.
+
+We recommend that build system authors use the above-mentioned ``clang++`` options  with ``clang-cl`` to build modules.
 
 Consistency Requirements
 ~~~~~~~~~~~~~~~~~~~~~~~~
@@ -1183,13 +1186,6 @@ have ``.cppm`` (or ``.ccm``, ``.cxxm``, ``.c++m``) as the file extension.
 However, the behavior is inconsistent with other compilers. This is tracked by
 `#57416 <https://github.com/llvm/llvm-project/issues/57416>`_.
 
-.. clang-cl is not compatible with standard C++ modules
-.. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-.. ``/clang:-fmodule-file`` and ``/clang:-fprebuilt-module-path`` cannot be used
-.. to specify the BMI with ``clang-cl.exe``. This is tracked by
-.. `#64118 <https://github.com/llvm/llvm-project/issues/64118>`_.
-
 Incorrect ODR violation diagnostics
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~