ZEPPELIN-1452: Include Phoenix 'thin client' instructions in docs
ZEPPELIN-1452: Include Phoenix 'thin client' instructions in docs

### What is this PR for?
Phoenix has two different connection types: thick and thin.
This PR is about describing the difference between the two and including properties for both in docs/interpreter/jdbc.md
### What type of PR is it?
Documentation

### What is the Jira issue?
[ZEPPELIN-1452](https://issues.apache.org/jira/browse/ZEPPELIN-1452)

### How should this be tested?
No tests necessary

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

Author: Randy Gelhausen <rgelhau@gmail.com>

Closes #1436 from randerzander/master and squashes the following commits:

3ed029e [Randy Gelhausen] Update jdbc.md
6e2dff0 [Randy Gelhausen] Update jdbc.md
2964ba8 [Randy Gelhausen] Update jdbc.md
d2720c3 [Randy Gelhausen] tweaked jdbc readme
38b1692 [Randy Gelhausen] Updated JDBC docs to include Phoenix thin client

(cherry picked from commit aff653bcad899cdf6cc382bb6d25ebe91ce5e429)
Signed-off-by: Mina Lee <bb9c4f68b7c04206772f92363630483486088f46@apache.org>

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