### What is this PR for?
It would be better if Zeppelin provides looking good documentation.
### What type of PR is it?
Improvement
### Todos
* [x] - Fix typos, grammars and Increase readability writingzeppelininterpreter.md
* [x] - Also spark.md
* [x] - tutorial.md
* [x] - cassandra.md
* [x] - elasticsearch.md
* [x] - flink.md
* [x] - hive.md
* [x] - lens.md
* [x] - markdown.md
* [x] - rest-interpreter.md
### Is there a relevant Jira issue?
No : )
### How should this be tested?
These documentations are in [here](http://zeppelin.incubator.apache.org/docs/0.6.0-incubating-SNAPSHOT/).
### 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: Ryu Ah young <fbdkdud93@hanmail.net>
Closes#578 from AhyoungRyu/Fix-Typo and squashes the following commits:
925f30e [Ryu Ah young] Fix the list of 'Configure your Interpreter'
9b768e9 [Ryu Ah young] Change .md -> .html in interpreter.md
785dcbb [Ryu Ah young] Fix odd space in spark.md
a5d26d7 [Ryu Ah young] Fix version 1.5.1 -> 1.5.2 in spark.md
ef77027 [Ryu Ah young] Fix Upper case -> Lower case in cassandra.md
0918f79 [Ryu Ah young] Fix grammar error and Increase readability interpreters.md
f3d0173 [Ryu Ah young] Add numbering for dividing the table list and Fix grammar error rest-interpreter.md
fe4dfff [Ryu Ah young] Fix image size unit px -> % and Increase readability markdown.md
11b32db [Ryu Ah young] Remove useless 'to' in lens.md
3eec4cf [Ryu Ah young] Remove numbering flink.md
aac2e01 [Ryu Ah young] Add short description about Apache hive and Increase readability hive.md
d08092a [Ryu Ah young] Add highlight for scala code and Increase readability flink.md
8690e02 [Ryu Ah young] Increase readability and remove useless <hr> tag elasticsearch.md
9c008cf [Ryu Ah young] Increase readability and Remove useless <br>, <hr> tag cassandra.md
3041b95 [Ryu Ah young] Change rebuild -> rebuilding in spark.md
99b1e9e [Ryu Ah young] Remove unnecessary space in writingzeppelininterpreter.md
c63e59f [Ryu Ah young] Increase readability and delete useless <br> tag tutorial.md
e867df3 [Ryu Ah young] Increase readability and delete useless <br>, <hr> tag spark.md
f72b1cb [Ryu Ah young] Add .sh next to .bin/zeppein-daemon
466f82c [Ryu Ah young] Fix some typos and grammars in writingzeppelininterpreter.md
