[docs] no-string-throw: add missing examples.

[BB9z]

PR checklist

• Addresses an existing issue: #0000
• New feature, bugfix, or enhancement
  • Includes tests
• Documentation update

Overview of change:

This PR is really simple. no-string-throw rule miss an example.

https://palantir.github.io/tslint/rules/no-string-throw/

Is there anything you'd like reviewers to focus on?

CHANGELOG.md entry:

[aervin]

@BB9z The ability to add code examples just landed in master. Will you please consider adding an example for this rule? I know it seems like a straightforward rule, but...

If you're willing, please see the curly rule for an example.

[BB9z]

@aervin Just merge and check the latest code. no-string-throw rule has not options, so just [true] is enough.

[aervin]

@BB9z The code examples would still be helpful for some people I think:

Passes:

try {
    // ...
} catch (e) {
    throw e;
}

Fails:

try {
    // ...
} catch {
    throw 'There was a problem.';
}

The ability to add these examples to the docs was just added to master. The curly rule has this sort of documentation, as an example.

[BB9z]

@aervin I see. The code examples have add into the rationale.

[aervin]

@BB9z Looking good! But please see these files for the best way to add code examples to rules:

• curly code examples file
• curly rule file

[BB9z]

@aervin done. Seems this is a new feature added two days ago :]