Update on-start.sh

[devisettysaivikas]

specify an output format and update available Environment.

Issue #, if available:

Description of changes:

Testing Done

• [Done] Notebook Instance created successfully with the Lifecycle Configuration
• [ Done] Notebook Instance stopped and started successfully
• Documentation in the script around any network access requirements
• Documentation in the script around any IAM permission requirements
• CLI commands used to validate functionality on the instance
• New script link and description added to README.md

# Provide your commands here
/you/commands/here

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