all: Fix spelling mistakes based on codespell check.

Signed-off-by: Damien George <damien@micropython.org>

ports/unix/coverage.c

@@ -539,7 +539,7 @@ STATIC mp_obj_t extra_coverage(void) {
     {
         mp_printf(&mp_plat_print, "# VM\n");
 
-        // call mp_execute_bytecode with invalide bytecode (should raise NotImplementedError)
+        // call mp_execute_bytecode with invalid bytecode (should raise NotImplementedError)
         mp_module_context_t context;
         mp_obj_fun_bc_t fun_bc;
         fun_bc.context = &context;

ports/unix/main.c

@@ -414,7 +414,7 @@ STATIC void pre_process_options(int argc, char **argv) {
                     #if MICROPY_PY_THREAD
                     mp_thread_is_realtime_enabled = true;
                     #endif
-                    // main thread was already intialized before the option
+                    // main thread was already initialized before the option
                     // was parsed, so we have to enable realtime here.
                     mp_thread_set_realtime();
                 #endif

ports/unix/modtermios.c

@@ -75,7 +75,7 @@ STATIC mp_obj_t mod_termios_tcsetattr(mp_obj_t fd_in, mp_obj_t when_in, mp_obj_t
         // We don't export TCSANOW and friends to save on code space. Then
         // common lazy sense says that passing 0 should be godo enough, and
         // it is e.g. for glibc. But for other libc's it's not, so set just
-        // treat 0 as defauling to TCSANOW.
+        // treat 0 as defaulting to TCSANOW.
         when = TCSANOW;
     }
 

ports/unix/variants/mpconfigvariant_common.h

@@ -41,7 +41,7 @@
 #define MICROPY_FLOAT_IMPL             (MICROPY_FLOAT_IMPL_DOUBLE)
 #endif
 
-// Enable arbritrary precision long-int by default.
+// Enable arbitrary precision long-int by default.
 #ifndef MICROPY_LONGINT_IMPL
 #define MICROPY_LONGINT_IMPL           (MICROPY_LONGINT_IMPL_MPZ)
 #endif