zeppelin/docs/development
Jun Kim be20201236 [DOC] Improve documents related to Helium
### What is this PR for?
What I did for the documents:
* Highlight codes
* Follow JSON syntax
* Remove white spaces

And in my opinion, [here](https://zeppelin.apache.org/docs/0.8.0-SNAPSHOT/development/writingzeppelinvisualization.html#1-create-a-npm-package) is ambiguous:
> "Normally, you can add any dependencies in package.json however Zeppelin Visualization package only allows two dependencies: zeppelin-vis and zeppelin-tabledata."

Does it want to say "you can add any dependencies in package.json, but you must include two dependencies: zeppelin-vis and zeppelin-tabledata."?

### What type of PR is it?
[Documentation]

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

Author: Jun Kim <i2r.jun@gmail.com>

Closes #2236 from tae-jun/helium-doc and squashes the following commits:

63505e9 [Jun Kim] Fix ambiguous sentence
3e775cf [Jun Kim] Highlight codes, follow JSON syntax, and remove white spaces
2017-04-17 15:57:31 +09:00
..
howtocontribute.md [ZEPPELIN-2123] [DOC] Link contribution guide 2017-02-19 18:26:19 +09:00
howtocontributewebsite.md [MINOR][DOC] Fix typo (re-open PR #1541 with rebase) 2016-10-23 12:44:06 +09:00
writingzeppelinapplication.md [DOC] Improve documents related to Helium 2017-04-17 15:57:31 +09:00
writingzeppelininterpreter.md [ZEPPELIN-1566] Make paragraph editable with double click 2016-10-29 10:30:22 +09:00
writingzeppelinspell.md [DOC] Improve documents related to Helium 2017-04-17 15:57:31 +09:00
writingzeppelinvisualization.md [DOC] Improve documents related to Helium 2017-04-17 15:57:31 +09:00
writingzeppelinvisualization_transformation.md [ZEPPELIN-2217] AdvancedTransformation for Visualization 2017-04-15 07:34:27 +09:00