[YUNIKORN-2462] incorrect gang annotations in example

What is this PR for?

Modified example:Gang scheduling for Spark jobs

What type of PR is it?

• [x] - Bug Fix
• [ ] - Improvement
• [ ] - Feature
• [ ] - Documentation
• [ ] - Hot Fix
• [ ] - Refactoring

Todos

• [ ] - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2462

How should this be tested?

Run web tests locally, Additionally, we can try to perform Gang scheduling for Spark jobs. [YUNIKORN-1755] update deployments/examples/spark/

Screenshots (if appropriate)

Questions:

• [ ] - The licenses files need update.
• [ ] - There is breaking changes for older versions.
• [ ] - It needs documentation.