typo fix in README_ru.md

Fix typo

remove broken link in /examples folder

Lowercasing.

Update cmd/README w/updated example URLs

Update branch names in internal/README

Update Readme_ja.md

minor fix

Updated example URLs to latest locations

Change branch names from `master` to `main` for projects that changed their branch names

pkg/README.md: Remove prometheus pkg

Update README_tr.md

mesos and bosh confuse new users.

Remove https://github.com/prometheus/prometheus/tree/main/pkg example as it doesn't exist anymore

small typo fix

Update README_ru.md

feat: add README_it

fix typo

That repo's master branch was renamed to main.

Making russian translation more readable