stm32/mpconfigport.h: Add option to have custom help text.
Define MICROPY_PY_BUILTINS_HELP_TEXT in <yourboard>/mpconfigboard.h for a
custom help text.
#define MICROPY_PY_BUILTINS_INPUT (1)
#define MICROPY_PY_BUILTINS_POW3 (1)
#define MICROPY_PY_BUILTINS_HELP (1)
+#ifndef MICROPY_PY_BUILTINS_HELP_TEXT
#define MICROPY_PY_BUILTINS_HELP_TEXT stm32_help_text
+#endif
#define MICROPY_PY_BUILTINS_HELP_MODULES (1)
#define MICROPY_PY_MICROPYTHON_MEM_INFO (1)
#define MICROPY_PY_ARRAY_SLICE_ASSIGN (1)
