chore: remove absolute paths (#3263)

# What does this PR do?
Finding these issues while moving to github pages.


## Test Plan
uv run --group docs sphinx-autobuild docs/source docs/build/html
--write-all

docs/source/advanced_apis/evaluation_concepts.md

@@ -33,7 +33,7 @@ The list of open-benchmarks we currently support:
 - [MMMU](https://arxiv.org/abs/2311.16502) (A Massive Multi-discipline Multimodal Understanding and Reasoning Benchmark for Expert AGI)]: Benchmark designed to evaluate multimodal models.
 
 
-You can follow this [contributing guide](https://llama-stack.readthedocs.io/en/latest/references/evals_reference/index.html#open-benchmark-contributing-guide) to add more open-benchmarks to Llama Stack
+You can follow this [contributing guide](../references/evals_reference/index.md#open-benchmark-contributing-guide) to add more open-benchmarks to Llama Stack
 
 #### Run evaluation on open-benchmarks via CLI