### What is this PR for?
1. Fix some typos in docs.
2. Remove trailing white spaces for each line.
3. Remove leading white spaces if a line contains no content.
4. Add trailing new line for each file.
### What type of PR is it?
Improvement | Documentation
### Todos
None
### What is the Jira issue?
N/A
### How should this be tested?
Build the doc site and check.
### Screenshots (if appropriate)
N/A
### Questions:
* Does the licenses files need update? *no*
* Is there breaking changes for older versions? *no*
* Does this needs documentation? *no*
Author: Cheng-Yu Hsu <m@cyhsu.me>
Closes#852 from cyhsutw/fix-typos-in-docs and squashes the following commits:
6f5f46b [Cheng-Yu Hsu] fix typos in docs
Details at the [ZEPPELIN-279](https://issues.apache.org/jira/browse/ZEPPELIN-279)
Author: Alexander Bezzubov <bzz@apache.org>
Closes#282 from bzz/ZEPPELIN-279-move-docs-to-master and squashes the following commits:
16d2cd0 [Alexander Bezzubov] ZEPPELIN-279: updating refs to new /docs location
a051a35 [Alexander Bezzubov] ZEPPELIN-279: moving website gh-pages -> master:/docs