chore(multi-instance): update description of related documents (#4470)

Signed-off-by: XiaoweiYan <yanxiaowei@xiaomi.com>
Co-authored-by: XiaoweiYan <yanxiaowei@xiaomi.com>

.github/pull_request_template.md

@@ -14,14 +14,14 @@ Be sure the following conventions are followed:
 - [ ] Prefer `enum`s instead of macros. If inevitable to use `define`s export them with `LV_EXPORT_CONST_INT(defined_value)` right after the `define`.
 - [ ] In function arguments prefer `type name[]` declaration for array parameters instead of `type * name`
 - [ ] Use typed pointers instead of `void *` pointers
-- [ ] Do not `malloc` into a static or global variables. Instead declare the variable in `LV_ITERATE_ROOTS` list in [`lv_gc.h`](https://github.com/lvgl/lvgl/blob/master/src/misc/lv_gc.h) and mark the variable with `GC_ROOT(variable)` when it's used. See a detaild description [here](https://docs.lvgl.io/master/get-started/bindings/micropython.html#memory-management).
+- [ ] Do not `malloc` into a static or global variables. Instead declare the variable in `lv_global_t` structure in [`lv_global.h`](https://github.com/lvgl/lvgl/blob/master/src/core/lv_global.h) and mark the variable with `(LV_GLOBAL_DEFAULT()->variable)` when it's used. See a detailed description [here](https://docs.lvgl.io/master/get-started/bindings/micropython.html#memory-management).
 - [ ] Widget constructor must follow the `lv_<widget_name>_create(lv_obj_t * parent)` pattern.
 - [ ] Widget members function must start with `lv_<modul_name>` and should receive `lv_obj_t *` as first argument which is a pointer to widget object itself.  
 - [ ] `struct`s should be used via an API and not modified directly via their elements.
 - [ ] `struct` APIs should follow the widgets' conventions. That is to receive a pointer to the `struct` as the first argument, and the prefix of the `struct` name should be used as the prefix of the function name too (e.g.  `lv_disp_set_default(lv_disp_t * disp)`)
 - [ ] Functions and `struct`s which are not part of the public API must begin with underscore in order to mark them as "private".
 - [ ] Arguments must be named in H files too.
-- [ ] To register and use callbacks one of the followings needs to be followed (see a detaild description [here](https://docs.lvgl.io/master/get-started/bindings/micropython.html#callbacks)): 
+- [ ] To register and use callbacks one of the following needs to be followed (see a detailed description [here](https://docs.lvgl.io/master/get-started/bindings/micropython.html#callbacks)):
   - For both the registration function and the callback pass a pointer to a `struct` as the first argument. The `struct` must contain `void * user_data` field.
   - The last argument of the registration function must be `void * user_data` and the same `user_data` needs to be passed as the last argument of the callback.
   - Callback types not following these conventions should end with `xcb_t`.

docs/get-started/bindings/micropython.rst

@@ -192,8 +192,8 @@ follow some coding conventions:
   function name too (e.g. :cpp:expr:`lv_disp_set_default(lv_disp_t * disp)`)
 - Functions and ``struct``\ s which are not part of the public API must begin with underscore in order to mark them as "private".
 - Argument must be named in H files too.
-- Do not ``malloc`` into a static or global variables. Instead declare the variable in :c:macro:`LV_ITERATE_ROOTS`
-  list in ``lv_gc.h`` and mark the variable with :cpp:expr:`GC_ROOT(variable)` when it's used. **See** :ref:`memory_management`
+- Do not ``malloc`` into a static or global variables. Instead declare the variable in ``lv_global_t``
+  structure in ``lv_global.h`` and mark the variable with :cpp:expr:`(LV_GLOBAL_DEFAULT()->variable)` when it's used. **See** :ref:`memory_management`
 - To register and use callbacks one of the following needs to be followed.  **See** :ref:`callbacks`
 
    - Pass a pointer to a ``struct`` as the first argument of both the registration function and the callback. That
@@ -231,15 +231,13 @@ Problem happens when an allocated memory's pointer (return value of :cpp:func:`l
 Solve The Problem
 ^^^^^^^^^^^^^^^^^
 
-- Replace the global/static local var with :cpp:expr:`LV_GC_ROOT(_var)`
-- Include ``lv_gc.h`` on files that use :c:macro:`LV_GC_ROOT`
-- Add ``_var`` to :c:macro:`LV_ITERATE_ROOTS` on ``lv_gc.h``
+- Replace the global/static local var with :cpp:expr:`(LV_GLOBAL_DEFAULT()->_var)`
+- Include ``lv_global.h`` on files that use ``LV_GLOBAL_DEFAULT``
+- Add ``_var`` to ``lv_global_t`` on ``lv_global.h``
 
 Example
 ^^^^^^^
 
-https://github.com/lvgl/lvgl/commit/adced46eccfa0437f84aa51aedca4895cc3c679c
-
 
 More Information
 ^^^^^^^^^^^^^^^^