Use correct attribution in the footer of documentation pages

[kou]

To be inline with ASF policy, we should update the text in the footer used in the docs (e.g. https://arrow.apache.org/adbc/current/index.html) to match the footer used in the main website (https://arrow.apache.org/). i.e. add the trademark attribution test.

[simicd]

Hi @kou, since I worked on apache/datafusion-python#553 and apache/datafusion-ballista#950 I also plan to raise a PR for this project if no-one else is working on it