brctl: add page; id, history, kill: add examples; kill: fix a typo

[mebeim]

• The page (if new), does not already exist in the repo.
• The page is in the correct platform folder (common/, linux/, etc.)
• The page has 8 or fewer examples.
• The PR title conforms to the recommended templates.
• The page follows the content guidelines.

---

• Add new page for the brctl linux command, a useful tool for creating and managing netwok ethernet interfaces.

• Add two examples for id:

  • The most basic example: id
  • An example showing how to check the id of a different user.

• Add one example for history on how to delete history entries.

• Add two examples for kill on how to work with multiple processes of the same group.

• Fixed a typo in the kill page:

  - pause a program, it until
  + pause a program until

[agnivade]

Hi @mebeim - Thanks for this. But in future, kindly create separate PRs for every page. So that when we review each page, the history belongs to that single page and we can easily choose to squash/rebase the commits.

Right now, it is not possible to squash the commits from the UI because it has unrelated commits for other pages.

[mebeim]

@agnivade thanks for pointing this out, I was not sure if multiple PRs would have been welcome or not. I applied the requested changes and will keep your suggestion in mind for the future.

[agnivade]

Sure, no worries. But please do not force push. It makes it difficult for us to see what changed in a review.

[mebeim]

Makes sense, thanks!