[FEATURE] Document EmpirioLabs in the LLM provider configuration examples

Feature Area

Documentation

Is your feature request related to a an existing bug? Please link it here.

NA

Describe the solution you'd like

docs/en/concepts/llms.mdx lists Provider Configuration Examples for the LiteLLM-backed providers, and EmpirioLabs is missing from that list even though it is a registered LiteLLM provider, so LLM(model="empiriolabs/<model>") already routes through the standard LiteLLM fallback path in crewai.llm with no code change.

The ask is one more accordion in that section, matching the existing Nebius AI Studio and SambaNova entries: the env var, an LLM(model=...) example, short feature notes, and the LiteLLM dependency note. English docs only.

Describe alternatives you've considered

Leaving it out and letting users work it out from the generic LiteLLM instructions. That works, but every other provider in the same position has an entry, so the omission just makes a supported provider look unsupported.