make examples work and help texts more consistent and readable.

This pull request should make: 
 * the CLI command examples work
 * CLI help texts more consistent 
 * and readable

This pull request changes: `core/modules/utils/fakedom.js` `formattedTextContent` handler.
Since it is only used to create command line output, there should be no side effects. 

`pre` and `li` now create an indentation with 4 spaces, which imo makes the help texts much more readable. The formatting in the TW output is not affected. 

see the difference with: 

```
node tiddlywiki.js --help     ... new
tiddlywiki --help              ... old if tiddlywiki is installed globally
or
node tiddlywiki.js --help server
tiddlywiki --help server
...
```
I know. But as I did test it the first time, I couldn't find where the output. So I did add the output parameter to every example.  .... If the user gets more experienced, it is even better to use the default values. .... But you have to be very careful, to load the right index.hmtl in the browser.

Sometimes I make changes. Do a browser reload. .... no changes found .... 
Edit the source again - build - reload .... just to see, that I did update the wrong index.html :)