This pull request updates the setup instructions for connecting to DocumentDB in the VS Code extension documentation. The changes improve clarity and provide more detailed, step-by-step guidance for users.

Improvements to documentation clarity and guidance:

• Updated the instruction to locate and select the DocumentDB icon in the VS Code sidebar, making the location more explicit for users.
• Replaced a single "Add New Connection" step with a detailed, multi-step nested list describing how to add a new local connection, including expanding the DocumentDB Local node, selecting the new connection option, confirming port and credentials, and noting TLS/SSL settings.
• Added a note clarifying that TLS/SSL can be enabled but is skipped in the walkthrough for simplicity.
• Clarified that a new DocumentDB Local entry will be added and listed in the DocumentDB Connections area after setup.