Merge pull request astaxie#201 from tianyl1984/patch-1

Update 06.2.md

Author: astaxie

ebook/06.2.md

@@ -81,19 +81,19 @@ Go实现整个的流程应该也是这样的，在main包中创建一个全局
 
 >以上设计思路来源于database/sql/driver，先定义好接口，然后具体的存储session的结构实现相应的接口并注册后，相应功能这样就可以使用了，以下是用来随需注册存储session的结构的Register函数的实现。
 
-	var provides = make(map[string]Provide)
+	var provides = make(map[string]Provider)
 
 	// Register makes a session provide available by the provided name.
 	// If Register is called twice with the same name or if driver is nil,
 	// it panics.
-	func Register(name string, provide Provide) {
-		if driver == nil {
+	func Register(name string, provider Provider) {
+		if provider == nil {
 			panic("session: Register provide is nil")
 		}
 		if _, dup := provides[name]; dup {
 			panic("session: Register called twice for provide " + name)
 		}
-		provides[name] = provide
+		provides[name] = provider
 	}
 
 ### 全局唯一的Session ID