Help: Clarify wording of include() for builtin module directories

Issue: #16312

Help/command/include.rst

@@ -15,10 +15,10 @@ is present, then no error is raised if the file does not exist.  If
 which has been included or NOTFOUND if it failed.
 
 If a module is specified instead of a file, the file with name
-<modulename>.cmake is searched first in :variable:`CMAKE_MODULE_PATH`,
+``<modulename>.cmake`` is searched first in :variable:`CMAKE_MODULE_PATH`,
 then in the CMake module directory.  There is one exception to this: if
-the file which calls ``include()`` is located itself in the CMake module
-directory, then first the CMake module directory is searched and
+the file which calls ``include()`` is located itself in the CMake builtin
+module directory, then first the CMake builtin module directory is searched and
 :variable:`CMAKE_MODULE_PATH` afterwards.  See also policy :policy:`CMP0017`.
 
 See the :command:`cmake_policy` command documentation for discussion of the