Fix typo in readme and changelog

[truongd3]

Issue #610

Fix typo errors in README.md and CHANGELOG.md

Description

README.md

1. Missing Dollar Sign for Variable ✅
   In the Create Objects section, the AdSetFields::CAMPAIGN_ID is missing a $ before campaign_id

2. Code Block Syntax Highlighting ✅
   Add shell tag for second code block line 335

CHANGELOG.md

1. Missing Parenthesis for Link Attachment ✅
   In the Unreleased v11.0.0, the link attached is missing a pair of parenthesis

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@stcheng has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@stcheng merged this pull request in 1fbdf60.