build: Run linter in Python CI Docs (#2603)

<!--
Thanks for opening a pull request!
-->

<!-- In the case this PR will resolve an issue, please replace
${GITHUB_ISSUE_ID} below with the actual Github issue id. -->
<!-- Closes #${GITHUB_ISSUE_ID} -->

# Rationale for this change

Run `make lint` in Python CI Docs to catch markdown style issues.

## Are these changes tested?
Yes.

## Are there any user-facing changes?
No.

<!-- In the case of user-facing changes, please add the changelog label.
-->

Author: manuzhang

.github/workflows/python-ci-docs.yml

@@ -45,3 +45,5 @@ jobs:
         run: make docs-install
       - name: Build docs
         run: make docs-build
+      - name: Run linters
+        run: make lint

mkdocs/docs/index.md

@@ -62,7 +62,7 @@ You can mix and match optional dependencies depending on your needs:
 | gcsfs         | GCSFS as a FileIO implementation to interact with the object store        |
 | rest-sigv4    | Support for generating AWS SIGv4 authentication headers for REST Catalogs |
 | pyiceberg-core | Installs iceberg-rust powered core                                       |
-| datafusion    | Installs both PyArrow and Apache DataFusion                               | 
+| datafusion    | Installs both PyArrow and Apache DataFusion                               |
 
 You either need to install `s3fs`, `adlfs`, `gcsfs`, or `pyarrow` to be able to fetch files from an object store.