chore(libs/jpg): rename lv_jpg to lv_tjpgd (#4573)

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>

docs/libs/index.rst

@@ -8,6 +8,7 @@
 
     fs
     bmp
+    tjpgd
     sjpg
     lodepng
     gif

docs/libs/tjpgd.rst

@@ -1,6 +1,6 @@
-===========
-JPG decoder
-===========
+=============
+TJPGD decoder
+=============
 
 Allow the use of JPG images in LVGL. Besides that it also allows the use
 of a custom format, called Split JPG (SJPG), which can be decoded in
@@ -83,13 +83,13 @@ The expected result is:
 Example
 -------
 
-.. include:: ../examples/libs/jpg/index.rst
+.. include:: ../examples/libs/tjpgd/index.rst
 
 
 API
 ---
 
-:ref:`lv_sjpg`
+:ref:`lv_tjpgd`
 
 :ref:`tjpgd`