fix(typescript): Fix reference.md generation for APIs with multiple root-level endpoints

[tstanmay13]

Description

Refs: Slack thread from @tstanmay13

Fixes a bug in the TypeScript SDK reference.md generator where APIs with multiple root-level endpoints would only show the last endpoint in the documentation, and an empty ## section header would appear.

Link to Devin run: https://app.devin.ai/sessions/ef19d2dcf49047abbf9983055b0331fa
Requested by: [email protected] (@tstanmay13)

Changes Made

• Moved section creation (addRootSection() or addSection()) outside the endpoint loop in generateSnippets()
• Previously, addRootSection() was called inside the endpoint loop for root packages, which replaced the root section on each iteration (discarding previous endpoints)
• Now uses a ternary to create the appropriate section type once before iterating through endpoints
• This aligns with the pattern used in other generators (Go, PHP, Ruby, etc.)

Testing

• Ran seed tests for multiple-request-bodies, alias, and extends fixtures
• Verified reference.md output now includes all root endpoints
• Verified empty ## section headers are removed
• Lint checks pass

Human Review Checklist

• Verify the logic change correctly moves section creation outside the endpoint loop
• Confirm seed output changes look correct (endpoints appear, empty headers removed)

[devin-ai-integration]

🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

• Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
• Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

• Disable automatic comment and CI monitoring