docs/develop/porting: Use mp_cstack_init_with_sp_here in docs.

Signed-off-by: Damien George <[email protected]>

Author: dpgeorge

docs/develop/porting.rst

@@ -42,7 +42,6 @@ The basic MicroPython firmware is implemented in the main port file, e.g ``main.
    #include "py/compile.h"
    #include "py/gc.h"
    #include "py/mperrno.h"
-   #include "py/stackctrl.h"
    #include "shared/runtime/gchelper.h"
    #include "shared/runtime/pyexec.h"
 
@@ -51,7 +50,7 @@ The basic MicroPython firmware is implemented in the main port file, e.g ``main.
 
    int main(int argc, char **argv) {
        // Initialise the MicroPython runtime.
-       mp_stack_ctrl_init();
+       mp_cstack_init_with_sp_here(2048);
        gc_init(heap, heap + sizeof(heap));
        mp_init();