Update examples from unexported *template return type

[erjoalgo]

In this section:
"

There are four main methods in this package:

func Render(data string, context ...interface{}) string

func RenderFile(filename string, context ...interface{}) string

func ParseString(data string) (*template, os.Error)

func ParseFile(filename string) (*template, os.Error)
"

Some of the return types are *template, not *Template as they should be