[clang-tidy][docs] Fix trailing whitespaces and lines longer than 80 characters #167098
Description
Some documentation files of clang-tidy contains trailing whitespaces or lines longer than 80 characters.
Currently, there are 33 files with trailing whitespaces and 343 files with lines > 80 chars.
We also need some automation (e.g. A lit test). This will act as a regression guard and ensure new contributions adhere to the standards.
This effort can be part of the broader documentation improvement goals tracked in issue #165999.