PR Checklist

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• The commit message follows our guidelines: https://github.com/nestjs/docs.nestjs.com/blob/master/CONTRIBUTING.md

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Docs
• Other... Please describe:

What is the current behavior?

Fix incorrect filename extension in "trust proxy" example under Security > Rate Limiting
The example hardcodes the ".ts" suffix when referencing the "main" file, resulting in incorrect filenames like "main.ts.ts" or "main.ts.js". This commit removes the fixed suffix to ensure correct file resolution based on the context.

Issue Number: N/A

What is the new behavior?

The updated example now aligns with the behavior of other code examples in the documentation by dynamically adjusting the filename between ".js" and ".ts", depending on the context. This prevents incorrect filenames like "main.ts.ts" or "main.ts.js" and ensures consistency across the documentation.

Does this PR introduce a breaking change?

• Yes
• No

Other information