olio-theme: Example rendering ignores sample values

The olio theme will ignore any sample values when rendering an example and uses default values instead.

[See this line (example.coffee#L23)](https://github.com/danielgtaylor/aglio/blob/c52a482e5392849de12ce1cf43245ad66da44745/src/example.coffee#L23)

Example:
```
+ someAttribute (string, required)
+ Sample: Test Sample String
```

The `root` variable will contain
```
{ element: 'string', attributes: { samples: [ 'Test Sample Stirng' ] } }
```
and the sample value will not be used.