[GitHub] [incubator-airflow] kaxil opened pull request #3872: [AIRFLOW-3030] Fix doc of command line interface

[GitHub]

This issue was found at https://github.com/apache/incubator-airflow/pull/3861
Make sure you have checked _all_ steps below.

### Jira

- [x] My PR addresses the following [Airflow 
Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references 
them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
  - https://issues.apache.org/jira/browse/AIRFLOW-XXX
  - In case you are fixing a typo in the documentation you can prepend your 
commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.

### Description

- [x] Here are some details about my PR, including screenshots of any UI 
changes:
- [X] Here are some details about my PR, including screenshots of any UI 
changes:

There are two issues found in documentation of command line interface

**Issue 1**
<img width="761" alt="screen shot 2018-09-07 at 4 34 12 pm" 
src="https://user-images.githubusercontent.com/11539188/45207953-01e23d80-b2bc-11e8-92a7-d08e7d5c54bf.png";>
The default value of `--subdir` is generated dynamically, so Kaxil's Dag Folder 
during compiling is used in the final documentation (this appeared 14 times in 
https://airflow.apache.org/cli.html). I believe this should be "hardcoded" into 
`[AIRFLOW_HOME]/dags`.

**Issue 2**
A minor typo (a space is missing).
<img width="769" alt="screen shot 2018-09-07 at 4 38 34 pm" 
src="https://user-images.githubusercontent.com/11539188/45208164-89c84780-b2bc-11e8-9ae9-4f72f48e8b37.png";>
### Tests

- [x] My PR adds the following unit tests __OR__ does not need testing for this 
extremely good reason:

### Commits

- [x] My commits all reference Jira issues in their subject lines, and I have 
squashed multiple commits if they address the same issue. In addition, my 
commits follow the guidelines from "[How to write a good git commit 
message](http://chris.beams.io/posts/git-commit/)":
  1. Subject is separated from body by a blank line
  1. Subject is limited to 50 characters (not including Jira issue reference)
  1. Subject does not end with a period
  1. Subject uses the imperative mood ("add", not "adding")
  1. Body wraps at 72 characters
  1. Body explains "what" and "why", not "how"

### Documentation

- [x] In case of new functionality, my PR adds documentation that describes how 
to use it.
  - When adding new operators/hooks/sensors, the autoclass documentation 
generation needs to be added.

### Code Quality

- [x] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`


[ Full content available at: 
https://github.com/apache/incubator-airflow/pull/3872 ]
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