[BugFix] Patch for refactored examples in platform markdown generator

[the-praxs]

[BugFix] Patch for refactored examples in platform markdown generator

1. Why?

   To patch the breaking changes for the examples in the openbb core package

2. What?

   • Added a new function get_endpoint_examples to get the examples as a formatted string
   • Removed the create_reference_markdown_examples function due to redundant use
   • Modified code to check for json_schema_extra in the field and extract multiple_items_allowed if present.

3. Impact

   • Impact Score = 14 (Moderate)
   • Not backwards compatible due to breaking changes in the openbb core package
   • Added internal dependency might affect performance notably

4. Testing Done

   Markdown files generated and tested locally on npm server

5. Reviewer Notes

   Please carefully check the generated docs to ensure they are similar to the deployed ones.