[BUG] API doc links for Java and Python API

[makuche]

Bug

Which Delta project/connector is this regarding?

• [x] Spark
• [ ] Standalone
• [ ] Flink
• [ ] Kernel
• [ ] Other (fill in here)

Describe the problem

Links to the API docs for the Java and Python API seem to be wrong in the README (see the links listed here), since they result in a 404 response.

Observed results

API links result in 404 response.

Expected results

Should be forwarded to Java API doc and respectively Python API doc

Willingness to contribute

I will open a PR to fix the links in the README

• [x] Yes. I can contribute a fix for this bug independently.
• [ ] Yes. I would be willing to contribute a fix for this bug with guidance from the Delta Lake community.
• [ ] No. I cannot contribute a bug fix at this time.