Help: Fix placement of one variable in cmake-variables manual

The `CMAKE_<LANG>_COMPILER_PREDEFINES_COMMAND` variable was recently
added slightly in the wrong place for the sorted ordering.

Help/manual/cmake-variables.7.rst

@@ -397,9 +397,9 @@ Variables for Languages
    /variable/CMAKE_LANG_COMPILER_EXTERNAL_TOOLCHAIN
    /variable/CMAKE_LANG_COMPILER_ID
    /variable/CMAKE_LANG_COMPILER_LOADED
+   /variable/CMAKE_LANG_COMPILER_PREDEFINES_COMMAND
    /variable/CMAKE_LANG_COMPILER_TARGET
    /variable/CMAKE_LANG_COMPILER_VERSION
-   /variable/CMAKE_LANG_COMPILER_PREDEFINES_COMMAND
    /variable/CMAKE_LANG_COMPILE_OBJECT
    /variable/CMAKE_LANG_CREATE_SHARED_LIBRARY
    /variable/CMAKE_LANG_CREATE_SHARED_MODULE