Documentation is wrong at ConfirmDialog attributes

[gdamoreira]

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Plunkr Case (Bug Reports)
#Irrelevant

Current behavior
The documentation of confirm dialog component has some errors in default values and types.

Expected behavior
The correct default values and types in documentation.

Minimal reproduction of the problem with instructions
You can see the incorrect values in showcase http://www.primefaces.org/primeng/#/confirmdialog

What is the motivation / use case for changing the behavior?
Just to contribute

Please tell us about your environment:
Notepad

• Angular version: 2.0.X
  Irrelevant

• PrimeNG version: 2.0.X
  Lastest

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
  Irrelevant

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  Irrelevant

• Node (for AoT issues): node --version =
  Irrelevant

PR: #1964