feat(doc): Update display-related documentation to new API (#5489)

docs/overview/draw.rst

@@ -77,7 +77,7 @@ display under the rest of the button too.
 The difference between buffering modes regarding the drawing mechanism
 is the following:
 
-1. **One buffer** - LVGL needs to wait for :cpp:func:`lv_disp_flush_ready` (called from ``flush_cb``) before starting to redraw the next part.
+1. **One buffer** - LVGL needs to wait for :cpp:func:`lv_display_flush_ready` (called from ``flush_cb``) before starting to redraw the next part.
 2. **Two buffers** - LVGL can immediately draw to the second buffer when the first is sent to ``flush_cb`` because the
    flushing should be done by DMA (or similar hardware) in the background.
 3. **Double buffering** - ``flush_cb`` should only swap the addresses of the frame buffers.

docs/overview/obj.rst

@@ -246,8 +246,8 @@ Handling multiple displays
 
 Screens are created on the currently selected *default display*. The
 *default display* is the last registered display with
-:cpp:func:`lv_disp_drv_register`. You can also explicitly select a new default
-display using :cpp:expr:`lv_disp_set_default(disp)`.
+:cpp:func:`lv_display_create`. You can also explicitly select a new default
+display using :cpp:expr:`lv_display_set_default(disp)`.
 
 :cpp:func:`lv_screen_active`, :cpp:func:`lv_screen_load` and :cpp:func:`lv_screen_load_anim` operate
 on the default display.

docs/overview/style.rst

@@ -505,7 +505,7 @@ example shows how to set the "default" theme:
                                            false,    /*Light or dark mode*/
                                            &lv_font_montserrat_10, &lv_font_montserrat_14, &lv_font_montserrat_18); /*Small, normal, large fonts*/
 
-   lv_disp_set_theme(display, th); /*Assign the theme to the display*/
+   lv_display_set_theme(display, th); /*Assign the theme to the display*/
 
 The included themes are enabled in ``lv_conf.h``. If the default theme
 is enabled by :c:macro:`LV_USE_THEME_DEFAULT` LVGL automatically initializes