ab: add CSV example and update pt_BR translation

[vitorhcl]

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The PR title conforms to the recommended templates.

[kbdharun]

LGTM, Thanks for your contribution.

[tldr-bot]

Hello! I've noticed something unusual when checking this PR:

• The page pages.bn/common/ab.md is outdated, based on number of commands.
• The page pages.de/common/ab.md is outdated, based on number of commands.
• The page pages.es/common/ab.md is outdated, based on number of commands.
• The page pages.fr/common/ab.md is outdated, based on number of commands.
• The page pages.id/common/ab.md is outdated, based on number of commands.
• The page pages.it/common/ab.md is outdated, based on number of commands.
• The page pages.ja/common/ab.md is outdated, based on number of commands.
• The page pages.ko/common/ab.md is outdated, based on number of commands.
• The page pages.nl/common/ab.md is outdated, based on number of commands.
• The page pages.no/common/ab.md is outdated, based on number of commands.
• The page pages.ru/common/ab.md is outdated, based on number of commands.
• The page pages.ta/common/ab.md is outdated, based on number of commands.
• The page pages.zh/common/ab.md is outdated, based on number of commands.

Is this intended? If so, just ignore this comment. Otherwise, please double-check the commits.

[reinhart1010]

Wait why are the brackets between numerical examples (like {{100}}) are being removed?

[vitorhcl]

Wait why are the brackets between numerical examples (like {{100}}) are being removed?

It's not because they are numerical values, it's because the description does not suggest that the user can change the value, so it's not really a placeholder. It will be properly docummented in #11946.