feat: explain span filtering for otel

[Steffen911]

Important

Adds documentation on filtering OpenTelemetry spans for Langfuse, including configuration examples and warnings.

• Documentation:
  • Adds section on filtering spans in get-started.mdx for OpenTelemetry with Langfuse.
  • Provides configuration example using filterprocessor to filter spans with gen_ai.system attribute set to openai.
  • Warns about potential incomplete traces and the necessity of sending root spans.

^{This description was created by for 38d235e. It will automatically update as commits are pushed.}

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Name	Status	Preview	Updated (UTC)
langfuse-docs	✅ Ready (Inspect)	Visit Preview	Feb 11, 2025 10:33am

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📦 Next.js Bundle Analysis for langfuse-docs

This analysis was generated by the Next.js Bundle Analysis action. 🤖

One Page Changed Size

The following page changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/docs/opentelemetry/get-started	38.54 KB	372.34 KB	106.38% (🟡 +0.16%)

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