fix(docs) minor fixes

docs/widgets/extra/imgbtn.md

@@ -20,7 +20,7 @@ You can set a left, right and center image, and the center image will be repeate
 ### Image sources
 To set the image in a state, use the `lv_imgbtn_set_src(imgbtn, LV_IMGBTN_STATE_..., src_left, src_center, src_right)`.
  
-The image sources works the same as described in the [Image object](/widgets/coreimg) except that, "Symbols" are not supported by the Image button.
+The image sources works the same as described in the [Image object](/widgets/core/img) except that, "Symbols" are not supported by the Image button.
 Any of the sources can `NULL`.
 
 The possible states are:

docs/widgets/extra/keyboard.md

@@ -35,7 +35,7 @@ To assign the text area, use `lv_keyboard_set_textarea(kb, ta)`.
 
 ### New Keymap
 You can specify a new map (layout) for the keyboard with `lv_keyboard_set_map(kb, map)` and `lv_keyboard_set_ctrl_map(kb, ctrl_map)`.
-Learn more about the [Button matrix](/widgets/btnmatrix) object.
+Learn more about the [Button matrix](/widgets/core/btnmatrix) object.
 Keep in mind that, using following keywords will have the same effect as with the original map:  
 - `LV_SYMBOL_OK` Apply.
 - `LV_SYMBOL_CLOSE` or `LV_SYMBOL_KEYBOARD` Close.

docs/widgets/extra/list.md

@@ -14,7 +14,7 @@ The List is basically a rectangle with vertical layout to which Buttons and Text
 - `LV_PART_SCROLLBAR` The scrollbar. See the [Base objects](/widgets/obj) documentation for details.
 
 **Buttons and Texts**
-See the [/widgets/core/btn](Button)'s and [/widgets/core/label](Label)'s documentation.
+See the [Button](/widgets/core/btn)'s and [Label](/widgets/core/label)'s documentation.
 
 ## Usage
 

docs/widgets/extra/spinner.md

@@ -19,7 +19,7 @@ To create spinner use `lv_spinner_create(parent, spin_time, arc_length)`. `spin
 ## Events
 No special events are sent the the Spinner.
 
-Learn more about [Events](/overview/events).
+Learn more about [Events](/overview/event).
 
 ## Keys
 No *Keys* are processed by the object type.