[ZEPPELIN-3644] fixed sparql interpreter documentation
[ZEPPELIN-3644] fixed sparql interpreter documentation

### What is this PR for?
see #3480

I fixed the documentation for the new configuration.
I also added an Acknowledgement, which I forgot, since I did this as part of a research-project at the Fraunhofer SCS.

### What type of PR is it?
Documentation

### Todos

### What is the Jira issue?

### How should this be tested?

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: hsteinmueller <harald.steinmueller@gmail.com>

Closes #3524 from hsteinmueller/sparql-hotfix and squashes the following commits:

df2f42035 [hsteinmueller] updated sparql readme

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