docs: improve scrollbar doc comment

[a-kenji]

I find the title is not really needed for the doc comment.

Alternative:

Rename tui-rs to ratatui in the title, but I find that this is not needed.

[codecov]

Codecov Report

Merging #329 (f988a7f) into main (df90982) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #329   +/-   ##
=======================================
  Coverage   85.05%   85.05%           
=======================================
  Files          40       40           
  Lines        8590     8590           
=======================================
  Hits         7306     7306           
  Misses       1284     1284           

Impacted Files	Coverage Δ
src/widgets/scrollbar.rs	87.71% <ø> (ø)

[joshka]

Actually that highlights something for me. That title should show up in the one line description of the struct, but it doesn't because it shows up in the re-exports because the scrollbar module is public. For consistency it shouldn't actually be public, but that required moving the sets. PR for that incoming. There should still be a one line description of the struct though, so just drop the tui-rs part.

[a-kenji]

Good catch!

I changed the title to be in line with existing widget titles.
I found this made the first line in the body obsolete.

[joshka]

Are you able to setup commit signing? https://docs.github.com/articles/about-gpg/

[joshka]

Thanks :) Merged!