chore: many trivial spelling and layout fixes (#3008)

Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>

src/extra/README.md

@@ -22,7 +22,7 @@ Here some ideas as inspiration feel free to contribute with ideas too.
 - Ruler, horizontal or vertical with major and minor ticks and labels
 - New [List items types](https://github.com/lvgl/lvgl/tree/master/src/extra/widgets/list)
 - [Preloaders](https://www.google.com/search?q=preloader&sxsrf=ALeKk01ddA4YB0WEgLLN1bZNSm8YER7pkg:1623080551559&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiwoN6d7oXxAhVuw4sKHVedBB4Q_AUoAXoECAEQAw&biw=952&bih=940)
-- Drop-down list with a container to which an content can be added
+- Drop-down list with a container to which content can be added
 - 9 patch button: Similar to [lv_imgbtn](https://docs.lvgl.io/8.0/widgets/extra/imgbtn.html) but 9 images for 4 corner, 4 sides and the center
 
 ## Contributors

src/extra/layouts/flex/lv_flex.c

@@ -274,7 +274,7 @@ static void flex_update(lv_obj_t * cont, void * user_data)
         place_content(track_cross_place, max_cross_size, total_track_cross_size, track_cnt, cross_pos, &gap);
     }
 
-    track_first_item =  f.rev ? cont->spec_attr->child_cnt - 1 : 0;
+    track_first_item = f.rev ? cont->spec_attr->child_cnt - 1 : 0;
 
     if(rtl && !f.row) {
         *cross_pos += total_track_cross_size;

src/extra/layouts/grid/lv_grid.c

@@ -420,7 +420,7 @@ static void calc(lv_obj_t * cont, _lv_grid_calc_t * calc_out)
 
 /**
  * Free the a grid calculation's data
- * @param calc pointer to the calculated gtrid cell coordinates
+ * @param calc pointer to the calculated grid cell coordinates
  */
 static void calc_free(_lv_grid_calc_t * calc)
 {

src/extra/widgets/calendar/lv_calendar.h

@@ -82,7 +82,7 @@ void lv_calendar_set_today_date(lv_obj_t * obj, uint32_t year, uint32_t month, u
 void lv_calendar_set_showed_date(lv_obj_t * obj, uint32_t year, uint32_t month);
 
 /**
- * Set the the highlighted dates
+ * Set the highlighted dates
  * @param obj           pointer to a calendar object
  * @param highlighted   pointer to an `lv_calendar_date_t` array containing the dates.
  *                      Only the pointer will be saved so this variable can't be local which will be destroyed later.
@@ -126,7 +126,7 @@ const lv_calendar_date_t * lv_calendar_get_today_date(const lv_obj_t * calendar)
 const lv_calendar_date_t * lv_calendar_get_showed_date(const lv_obj_t * calendar);
 
 /**
- * Get the the highlighted dates
+ * Get the highlighted dates
  * @param calendar pointer to a calendar object
  * @return pointer to an `lv_calendar_date_t` array containing the dates.
  */

src/extra/widgets/chart/lv_chart.h

@@ -330,7 +330,7 @@ lv_chart_cursor_t  * lv_chart_add_cursor(lv_obj_t * obj, lv_color_t color, lv_di
  * Set the coordinate of the cursor with respect to the paddings
  * @param obj       pointer to a chart object
  * @param cursor    pointer to the cursor
- * @param pos       the new coordinate of cursor relative the the chart
+ * @param pos       the new coordinate of cursor relative to the chart
  */
 void lv_chart_set_cursor_pos(lv_obj_t * chart, lv_chart_cursor_t * cursor, lv_point_t * pos);
 

src/extra/widgets/keyboard/lv_keyboard.h

@@ -141,7 +141,7 @@ static inline const char ** lv_keyboard_get_map_array(const lv_obj_t * kb)
 
 /**
  * Get the index of the lastly "activated" button by the user (pressed, released, focused etc)
- * Useful in the the `event_cb` to get the text of the button, check if hidden etc.
+ * Useful in the `event_cb` to get the text of the button, check if hidden etc.
  * @param obj       pointer to button matrix object
  * @return          index of the last released button (LV_BTNMATRIX_BTN_NONE: if unset)
  */

src/extra/widgets/led/lv_led.c

@@ -66,7 +66,7 @@ lv_obj_t * lv_led_create(lv_obj_t * parent)
 /**
  * Set the color of the LED
  * @param led       pointer to a LED object
- * @param color     the color of the the LED
+ * @param color     the color of the LED
  */
 void lv_led_set_color(lv_obj_t * obj, lv_color_t color)
 {

src/extra/widgets/led/lv_led.h

@@ -66,7 +66,7 @@ lv_obj_t * lv_led_create(lv_obj_t * parent);
 /**
  * Set the color of the LED
  * @param led       pointer to a LED object
- * @param color     the color of the the LED
+ * @param color     the color of the LED
  */
 void lv_led_set_color(lv_obj_t * led, lv_color_t color);
 

src/extra/widgets/menu/lv_menu.c

@@ -724,7 +724,7 @@ static void lv_menu_back_event_cb(lv_event_t * e)
 
 static void lv_menu_value_changed_event_cb(lv_event_t * e)
 {
-    lv_obj_t * obj =  lv_event_get_user_data(e);
+    lv_obj_t * obj = lv_event_get_user_data(e);
     lv_menu_t * menu = (lv_menu_t *)obj;
 
     lv_menu_page_t * main_page = (lv_menu_page_t *)lv_menu_get_cur_main_page(obj);

src/extra/widgets/menu/lv_menu.h

@@ -209,7 +209,7 @@ lv_obj_t * lv_menu_get_sidebar_header(lv_obj_t * obj);
 lv_obj_t * lv_menu_get_sidebar_header_back_btn(lv_obj_t * obj);
 
 /**
- * Check if a obj is a root back btn
+ * Check if an obj is a root back btn
  * @param menu pointer to the menu
  * @return true if it is a root back btn
  */