Incorrect documentation for InnoSetup Alias

[SIkebe]

cake/src/Cake.Common/Tools/InnoSetup/InnoSetupAliases.cs

Lines 47 to 49 in ba349da

	/// InnoSetup("./src/Cake.iss", new InnoSetupSettings {
	/// OutputDir = outputDirectory
	/// });

There is no property named OutputDir on InnoSetupSettings class.
That should be OutputDirectory.

InnoSetup("./src/Cake.iss", new InnoSetupSettings {
    OutputDirectory = outputDirectory
    });

[devlead]

Fixed by #2221