docs fix spelling, parameter descriptions, comments, etc (#2865)

examples/libs/ffmpeg/lv_example_ffmpeg_1.c

@@ -2,7 +2,7 @@
 #if LV_USE_FFMPEG && LV_BUILD_EXAMPLES
 
 /**
- * Open a image from a file
+ * Open an image from a file
  */
 void lv_example_ffmpeg_1(void)
 {

examples/libs/rlottie/lv_example_rlottie_1.py

@@ -2,7 +2,7 @@
 import lvgl as lv
 import display_driver
 #
-# Load an lottie animation from flash
+# Load a lottie animation from flash
 #
 from lv_example_rlottie_approve import lv_example_rlottie_approve
 

examples/widgets/keyboard/lv_example_keyboard_1.py

@@ -9,7 +9,7 @@ def ta_event_cb(e,kb):
         kb.set_textarea(None)
         kb.add_flag(lv.obj.FLAG.HIDDEN)
         
-# Create a keyboard to use it with an of the text areas
+# Create a keyboard to use it with one of the text areas
 kb = lv.keyboard(lv.scr_act())
 
 # Create a text area. The keyboard will write here

examples/widgets/roller/lv_example_roller_3.c

@@ -51,7 +51,7 @@ static void mask_event_cb(lv_event_t * e)
 }
 
 /**
- * Add an fade mask to roller.
+ * Add a fade mask to roller.
  */
 void lv_example_roller_3(void)
 {

examples/widgets/roller/lv_example_roller_3.py

@@ -8,7 +8,7 @@ class Lv_Roller_3():
         self.mask_bottom_id = -1
         
         # 
-        # Add an fade mask to roller.
+        # Add a fade mask to roller.
         #
         style =  lv.style_t()
         style.init()
@@ -94,6 +94,6 @@ class Lv_Roller_3():
             lv.draw_mask_remove_id(self.mask_top_id)
             lv.draw_mask_remove_id(self.mask_bottom_id)
             self.mask_top_id = -1;
-            self.mask_bottom_id = -1;        
+            self.mask_bottom_id = -1;
             
 roller3 = Lv_Roller_3()