update document.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

multitemplate.go

@@ -7,14 +7,17 @@ import (
 	"github.com/gin-gonic/gin/render"
 )
 
+// Render type
 type Render map[string]*template.Template
 
 var _ render.HTMLRender = Render{}
 
+// New instance
 func New() Render {
 	return make(Render)
 }
 
+// Add new template
 func (r Render) Add(name string, tmpl *template.Template) {
 	if tmpl == nil {
 		panic("template can not be nil")
@@ -25,31 +28,36 @@ func (r Render) Add(name string, tmpl *template.Template) {
 	r[name] = tmpl
 }
 
+// AddFromFiles supply add template from files
 func (r Render) AddFromFiles(name string, files ...string) *template.Template {
 	tmpl := template.Must(template.ParseFiles(files...))
 	r.Add(name, tmpl)
 	return tmpl
 }
 
+// AddFromGlob supply add template from global path
 func (r Render) AddFromGlob(name, glob string) *template.Template {
 	tmpl := template.Must(template.ParseGlob(glob))
 	r.Add(name, tmpl)
 	return tmpl
 }
 
+// AddFromString supply add template from strings
 func (r *Render) AddFromString(name, templateString string) *template.Template {
 	tmpl := template.Must(template.New(name).Parse(templateString))
 	r.Add(name, tmpl)
 	return tmpl
 }
 
+// AddFromFilesFuncs supply add template from file callback func
 func (r Render) AddFromFilesFuncs(name string, funcMap template.FuncMap, files ...string) *template.Template {
 	tname := filepath.Base(files[0])
 	tmpl := template.Must(template.New(tname).Funcs(funcMap).ParseFiles(files...))
 	r.Add(name, tmpl)
 	return tmpl
 }
 
+// Instance supply render string
 func (r Render) Instance(name string, data interface{}) render.Render {
 	return render.HTML{
 		Template: r[name],