Minor documentation update.

Author: pcc

clang/docs/ControlFlowIntegrity.rst

@@ -19,11 +19,12 @@ of undefined behavior that can potentially allow attackers to subvert the
 program's control flow. These schemes have been optimized for performance,
 allowing developers to enable them in release builds.
 
-To enable Clang's available CFI schemes, use the flag ``-fsanitize=cfi``.
-You can also enable a subset of available :ref:`schemes <cfi-schemes>`.
-As currently implemented, all schemes rely on link-time optimization (LTO);
-so it is required to specify ``-flto``, and the linker used must support LTO,
-for example via the `gold plugin`_.
+To enable Clang's available CFI schemes, use the flag
+``-fsanitize=cfi``. You can also enable a subset of available
+:ref:`schemes <cfi-schemes>`. As currently implemented, all schemes
+except for ``kcfi`` rely on link-time optimization (LTO); so it is
+required to specify ``-flto`` or ``-flto=thin``, and the linker used
+must support LTO, for example via the `gold plugin`_.
 
 To allow the checks to be implemented efficiently, the program must
 be structured such that certain object files are compiled with CFI