Update documentation.yml

Author: ZiyiXia

.github/workflows/documentation.yml

@@ -16,7 +16,7 @@ jobs:
           pip install . sphinx myst_parser myst-nb sphinx-design pydata-sphinx-theme sphinxcontrib-googleanalytics
       - name: Install content dependencies
         run: |
-          pip install faiss-cpu air-benchmark beir
+          pip install faiss-cpu mteb air-benchmark beir
       - name: Sphinx build
         run: |
           sphinx-build docs/source docs/build