Enable line-length lint for markdown docs

[ThomsonTan]

Changes

This follows open-telemetry/opentelemetry-dotnet#3049 and enables line-length lint but still disable it for code block and tables where limiting line length reduces readability.

Thanks @reyang to recommendation.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #1268 (a39a28c) into main (49648bd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1268   +/-   ##
=======================================
  Coverage   92.37%   92.37%           
=======================================
  Files         202      202           
  Lines        7336     7336           
=======================================
  Hits         6776     6776           
  Misses        560      560           

[lalitb]

Looks good to me, though not a big fan of MD013 😄. Can we disable this for lines containing URLs too - if possible, else let it be.

[ThomsonTan]

Looks good to me, though not a big fan of MD013 😄. Can we disable this for lines containing URLs too - if possible, else let it be.

The line with long URL is already considered by the markdownlint tool.