fix(docs): fix broken links

[becseya]

Fixing broken links of:

• https://github.com/lvgl/lvgl/issues/new/choose
  CODING_STYLE.md -> Open button goes to old file
• https://docs.lvgl.io/master/integration/bindings/micropython.html#lvgl-c-api-coding-conventions
  CODING_STYLE goes to 404 Not found

[liamHowatt]

Nice! I tested the docs link and it works!

[kisvegabor]

Thanks! (I thought there will be more broken links 😅 )

[becseya]

@kisvegabor there might be, that's why I opened #6208

[liamHowatt]

Nice. Looks like the link text matches the header name closest to the ref. If you wanted "CODING STYLE" back, you could do :ref:`CODING STYLE <coding-style>` like here.

Looks good the way it is though:

[becseya]

I actually prefer matching the title over all caps.

On the other hand, the dot at the end of the sentence was removed accidentally, so I've pushed again.