[GitHub] [incubator-airflow] XD-DENG opened pull request #3924: [AIRFLOW-XXX] Fix a wrong sample bash command, a display issue & a few typos

[GitHub]

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:

**1. A wrong sample bash command**
https://airflow.incubator.apache.org/howto/secure-connections.html
<img width="797" alt="screen shot 2018-09-20 at 9 46 32 am" 
src="https://user-images.githubusercontent.com/11539188/45790992-2ece2180-bcba-11e8-8f19-4737efcf29da.png";>
This sample bash command for sure would not work. It should be `export 
AIRFLOW__CORE__FERNET_KEY=your_fernet_key` (lowercase 'export' and no spaces 
around `=`)

**2. A display issue**
https://airflow.incubator.apache.org/kubernetes.html?highlight=kubernetes
<img width="766" alt="screen shot 2018-09-20 at 9 47 00 am" 
src="https://user-images.githubusercontent.com/11539188/45790988-2c6bc780-bcba-11e8-9e73-d2e09e527fb0.png";>
There are two items, `-Dags` and `-Logs`. But because an empty line is missing 
in the RST file, this part is not displayed correctly.

**3. A few typos**
A few other typos in different sections.

### Tests

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

Only documentation change.

### Commits

- [ ] 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

- [ ] 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

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


[ Full content available at: 
https://github.com/apache/incubator-airflow/pull/3924 ]
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