refactor: notify.txt typos (#6616)

---

- Treat all work as PUBLIC. Private `feature/x` branches will not be
squash-merged at release time.
- Your code changes must meet the guidelines in
[CONTRIBUTING.md](https://github.com/aws/aws-toolkit-vscode/blob/master/CONTRIBUTING.md#guidelines).
- License: I confirm that my contribution is made under the terms of the
Apache 2.0 license.

Author: hayemaxi

buildspec/release/notify.txt

@@ -1,6 +1,6 @@
-Released ${EXTENSION_NAME} v${VERSION} for VSCode
+Released ${EXTENSION_NAME} v${VERSION} for VS Code
 
 ${CHANGELOG}
 
 Changelog: https://github.com/aws/aws-toolkit-vscode/blob/master/packages/${TARGET_EXTENSION}/CHANGELOG.md
-Release Arifact: https://github.com/aws/aws-toolkit-vscode/releases/tag/${TARGET_EXTENSION}/v${VERSION}
+Release Artifact: https://github.com/aws/aws-toolkit-vscode/releases/tag/${TARGET_EXTENSION}/v${VERSION}